Initial commit

123 files changed, 16269 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bd7fab4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.clang-format
diff --git a/2015/01/.gitignore b/2015/01/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2015/01/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2015/01/Makefile b/2015/01/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2015/01/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2015/01/input b/2015/01/input
new file mode 100644
index 0000000..73e014e
--- /dev/null
+++ b/2015/01/input
@@ -0,0 +1 @@
+(((())))()((((((((())()(()))(()((((()(()(((()((()((()(()()()()()))(((()(()((((((((((())(()()((())()(((())))()(()(()((()(()))(()()()()((()((()(((()()(((((((()()())()((((()()(((((()(())()(())((())()()))()(((((((())(()())(()(((())(()))((())))(()((()())))()())((((())))(()(((((()(())(((()()((()((()((((((((((())(()())))))()))())()()((((()()()()()()((((((())())(((()())()((()()(((()()()))(((((()))(((()(()()()(()(()(((())()))(()(((()((())()(()())())))((()()()(()()(((()))(((()((((()(((((()()(()())((()())())(()((((((()(()()))((((()))))())((())()()((()(()))))((((((((()))(()()(((())())(())()((()()()()((()((()((()()(((())))(()((())()((((((((()((()(()()(((())())())))(())())))()((((()))))))())))()()))()())((()())()((()()()))(()()(((()(())((((())())((((((((()()()()())))()()()((((()()))))))()((((()(((()))(()()())))((()()(((()))()()())())(((())((()()(())()()()(((())))))()())((()))()))((())()()())()())()()(()))())))())()))(())((()(())))(()(())(()))))(()(())())(()(())(()(()))))((()())()))()((((()()))))())))()()())((())()((()()()))()(((()(()))))(())()()))(((()())))))))))(((())))()))())()))))()()(((())))))))()(()()(()))((()))))((())))((()((())))())))()()(()))())()(()((()())(()(()()())())(()()))()))))(()())()()))()()()()))(()(()(()))))))()(()))()))()()(()((())(()(())))()(((())(())())))))()(()(()))))()))(()()()(())()(()(())))()))))()()(((((())))))())()())())())()())()))))()))))))))())()()()()()()())))()))((())()))())))()((())()))))()))())))))))())()()()))()()(()((((()(((((((()(())((()())((()()))()))))(())))()()()(())((())()())))(())))(())))(((()()))()(())(((()(()))((())))())()))((((()))())()))))))))()(())())))(()))()(()()))())()()(())())))())()()(()())))()((()())(()(())(())))))))))))))(()))))()))))))()()())(()(((((()(()())))())()))(()))()))(()()))()())(()))())()(())((()()))))))())))())()(((())))(()(()))()()))()(()))))))((()())(()))))))()())))()()))))))))((((((((()()()(()))))))()())))())))()()((())()))((())(())))())())))()()()((()((()(())))())()(())))))))))()())))()()()()()()))()))((())())(()(()))))))(()()))()))(())))()))))))))))))(()))))))))()))))()))()())()))()()))))))()))))((()))))(()))())()(())))(()())((((()())))()))))(()))()(()()(())))))())))))()))))))())))())))))())))())())))())(()))))(())()(())))())()))((()()))))))())))((())))))))())))(())))))()()())))))())))))()))))))()))()()()(()(((()())())())(()))())))))((()(())(()))))))))(())))()()()())())(()))))()()()))()))())())())()(())))()(((()((((())))))))()))))))))))))))))))))((())()())(()))))()()))))))(()()(())())))())))((())))((())))))))))))))()))))()(()))))))())))))()))(()()())(()())))))))))()))))))(())))))()()))()())(((())))()))(()))))))))(())())))())))())())())()()))((())()(())()())()))()())(())(()))))()())))(()(((()))))))()(()())()()()))()))))))))()()()(())()())()(((((()))()())())(()))))()()()(())))())))()((()())))(()))())()(()())())(()))()()))((()()))((()()()()())))(())()))(()(())))((()()))))))))())))))))())()()))))))))))))))))(())()(())(())()())())()))()(()))))())())))))()())()(()))()()(())))(())())))))(()))))))))))))))())())(())(())))(((()))()))))())((())(()))())))))))())))))())))()))()))))))))))))())()))))()))))((()))(())))()(())))(())()))()))())))())))))))()(()())())))()()())))(())))))(()))))))))))))(()))()))()))())))(((()()()(())((()())))()())(((()))(())()))((()()()())))())(())(()))))()(((((())))(()))())())))))))((((()()()))())())()(()(()())))))))))()())())))(())))()())(((()(())())()()))())())))))))((()())((()()(()))(()(())))()))()))(()))(()))()()(()(((())((((()))()(()))((())()(()(()())()(()))()())))))(()))()))())()())))())))(())))((())(()())))))()))(())(()))()())()(()()((()(()))))))()(())(()())(())()))(((())()))(()()(()()()))))(()(())))()))))())))))())(()()()()()()(((())))(()()))()((())(((((()()())))(()))(()))()()))(((())())()(((()()()()))))(()))(())())))()())(()()())())))))))()))))((())))()())(()))(()(()))())))))())(())))))()()())())()))()()(())))(()))(())((((((())(()))(()))())()))(()()(())))()))(()()))()))()(())))(())))((()(()))(())()()())())))(((()()())(())()))))))()(((()(((((()()(((())(())))())()((()))))((()())()(())(((())))(((()((()(()(()))(()()))())(()))(())(())))()))))))((((()))()((((()(()))()))()()))))()(()(()))()(()((()(((()(()()(((()))))()(((()(()(()(((()(()())())()()(()(()())())(()((((())(()))()))(((((()()())(())()((()()())))()()(((()()))()((((((((()(())))())((()))))(())))(()))))((()((((()()(())(((((()))(((((((((((((()())))((((()(((()((())())()))((()))()(()()((()()()()(()()(()(()(((())()(()((((((()((()()((())()((((()((()()(()()())((()()()((()((())()(()(((()((())((((())(()))((()(()))(()())()((((((((()(((((((((((()))(()(((()(()()()((((())((())()())()))(())((())(()))(((()((()(())))(()))))((()()))))((((()(()(()())(()(())((((((((()((((()((()(((((()))())()(()))(()()((()(())(((((()(())()(((((()()))))))()(((())()(()()((((())()((())((()(((())(((()))((()()((((()(())))))((()((((()((()((()(((())((()))(((((((()(((()((((((((())()))((((())(((((()((((((((()(((()((()(((()()(((()((((((()()(()((((((((()()(()(()(())((((()())()))))(((()))((((())((((()())((()(())()((()((((((()(((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\ No newline at end of file
diff --git a/2015/01/puzzles.c b/2015/01/puzzles.c
new file mode 100644
index 0000000..6690a64
--- /dev/null
+++ b/2015/01/puzzles.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(void)
+{
+	int c;
+	FILE *fp = fopen("input", "r");
+
+	register int floor = 0;
+	for (register unsigned int i = 1; (c = fgetc(fp)) != EOF; i++) {
+		floor += (c == '(') ? 1 : -1;
+#ifdef PART2
+		if (floor == -1) {
+			printf("%u\n", i);
+			return EXIT_SUCCESS;
+		}
+#endif
+	}
+
+	fclose(fp);
+	printf("%d\n", floor);
+
+	return EXIT_SUCCESS;
+}
diff --git a/2015/02/input b/2015/02/input
new file mode 100644
index 0000000..5f3335f
--- /dev/null
+++ b/2015/02/input
@@ -0,0 +1,1000 @@
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diff --git a/2015/02/puzzle-1.awk b/2015/02/puzzle-1.awk
new file mode 100755
index 0000000..e316ba2
--- /dev/null
+++ b/2015/02/puzzle-1.awk
@@ -0,0 +1,20 @@
+#!/usr/bin/env -S awk -f
+
+function min(a, b, c)
+{
+	if (a <= b && a <= c)
+		return a
+	if (b <= a && b <= c)
+		return b
+	return c
+}
+
+BEGIN { FS = "x" }
+{
+	x = $1 * $2
+	y = $2 * $3
+	z = $1 * $3
+
+	sum += (2 * x) + (2 * y) + (2 * z) + min(x, y, z)
+}
+END   { print sum }
diff --git a/2015/02/puzzle-2.awk b/2015/02/puzzle-2.awk
new file mode 100755
index 0000000..e031b94
--- /dev/null
+++ b/2015/02/puzzle-2.awk
@@ -0,0 +1,20 @@
+#!/usr/bin/env -S awk -f
+
+function min(a, b, c)
+{
+	if (a <= b && a <= c)
+		return a
+	if (b <= a && b <= c)
+		return b
+	return c
+}
+
+BEGIN { FS = "x" }
+{
+	x = $1 + $1 + $2 + $2
+	y = $2 + $2 + $3 + $3
+	z = $1 + $1 + $3 + $3
+
+	sum += $1 * $2 * $3 + min(x, y, z)
+}
+END   { print sum }
diff --git a/2015/03/input b/2015/03/input
new file mode 100644
index 0000000..6e8d40e
--- /dev/null
+++ b/2015/03/input
@@ -0,0 +1 @@
+^^<<v<<v><v^^<><>^^<v<v^>>^^^><^>v^>v><><><<vv^^<^>^^<v^>v>v^v>>>^<>v<^<v^><^>>>>><<v>>^>>^>v^>><<^>v>v<>^v^v^vvv><>^^>v><v<><>^><^^<vv^v<v>^v>>^v^>v><>v^<vv>^><<v^>vv^<<>v>>><<<>>^<vv<^<>^^vv>>>^><<<<vv^v^>>><><^>v<>^>v<v^v<^vv><^v^><<<<>^<>v>^v>v<v<v<<>v<^<<<v>>>>>^^v>vv^^<>^<>^^^^<^^^v<v^^>v<^^v^^>v>^v^^^^>><<v<>v<>^v^<v<>><>^^><<^^<^^>vv<>v^<^v<vv<<<>^>^^>^<>v^^vv<>>v><<<>vvv<>v<>><^<^v<>^vv>^^v<v<v><^<>>vv<^>>^>>vv^v<vv^vv<^<<>>^v^<>^>>>>vv>^^>v>vv>v><^vv^<<v>^<<^^<v<v>vv<v^^<>^^v>^>>v><^<<vv<<v^vv^^^v>>v<<v^><vv^><vv<^vv<<vv^v<<^v<^^v>><<v^>>^^<>v>><<v<>>^^<v>>^^>>vvv^><<<<<^<^vv<^<><v<<>^^^<<<^>^^^<v<<vv>vv<>^<>v<^v>^<<<v<v<v>>^v<>>v<<^<<v<<>^<<<><><>^>>>>^>v^v<<v<v<<>>vv<^vvv^^^^<vv>vv>^v^^v^<v^v><^vv<^vv>v<^>vv<>>^>^><vv<><^>v>^v>vvv<>^>^v<><>vv>><^v^<><><v>>v^v^><^<^>vv>v<^>vvv>v<<<<<^<v<<vv<^^^<<>>^v<vv<^<>v>^<v<>><><>^<<v>v^>^<vv>><><>>^>^>><^<v>^^>^^>^^v^^<^v^^>v^^>>><<><v<v<<v^vv<><><>^<v>^<<^^v^>v>><>^^^><^vvv<^^^^^v><<><v<^^v><><>>^>vv<vvvv<<>>><v<^^^^v<<^><v>^vv<v^^v^vv<^^>^^<v>><<v^>v<^^>^<^<v<^^v>^<<v>^>>>^v<>v<^^^>vvv^v<<^><>>><vvv^<^^^<^>>v>>><v>^^vvv^vvv<^^^^v^v^<vv^<v>^<<^>v^v^<<><>><^v><v<><<>><<<>^v>v<>^<v^v>^vv>>^<>v^^<<v><^v>>v<>>^v^^>><^>v^<^v^^>><>v^>^v^v<<<v^<v^^v<^>v<><>vv>>>>^>v<>v<<<>^^>vv^v<><v^<>^<<<<>>^^>^v<v^v<<><>^v<>>^v^<<^<^>>>^vv<><v<^^<>v^>>v<^^v<v>>>^>><<><<<>><vv<v>>^v>><^<v><vv>^vv<v<>>><>v^><>vv<^^v^^^v<>><^vvv<<^<>v>>>v>><v><>>><>><v^><v^v<v>^v>v<v>>^^<^>^>v><>vv>^v><<>>>>>>>^<<^vv^^vvvv<^^><<<v<<>vvv<>^><<v<v^v^<<v>v<>>^<vv^<v<v>^<<^^vv>v>^<vv<<>v<v^<>v>>^v^^vvvv>^^>>v^v^^><<^>v>>^^>^<^^<>v<v>vv^vv>v<v>>^v<><^vv^<vv<v^^^v<^v^>>^v>>>^^<^<^>^v^>^>>>^v>^>^^^>>^<>v^^<>^v<<^^>^^<vv<>v<^v^>><^v^>^<>>^vv^vv^>v^<vvvvvv^>><^^<^v<^<v^<<^^<<v^<^>><>v><^v^v^^^v>v^<>^<<v<^^vvv<v>^^>^v^^<><vv^v^>v^<<>>vv<>>>>v>v<>^>>>v<>^^><v<v^^^<>^<^><>^><<v>><>^<<>>><<^<vvv<^><v>>^vv^v>><v<>vv^<<^^<<><v><<^<v<vv<<^v^vv>v^>>>v<<<<v<<>v>^vv<^v><v<v>v<^>^^vv>v><v>><<v<<v^v>>><>^<>><><<^<<^v^v<<v>v>v<v<^^>vv<^v^^^<v^<<<v<>v^><^v>^<^<v>>^<<<v>>v^<><>>^v<>vvv<vvvvv<^^><^>><^^>^>^v^vv<^><<^v>><^^v>^v<>^>vvvv><^>^<<v^^vv<v^^<><>v>^>>^<^<<<^v^^^>^>>^>><><<^>v^^<v>>v<<<<vvv<vvvv^<^<v^^<>^>vvv^<vv^v^v>^<<><v><^v^v^^^>^^>^vv<>v>>v^>vv^vv>v<^v^^>>^v^v<>>^^><<v<<>><>>>^>^<>^^v^^><^<>><<^<vv^^^^^>>vv^<v^<^>>>>v<<><<^>vv>vvv>^<><>>>>vv><<v^v<^^^<<^^^vv^<v<><><<<<>><<v^<>v>v^><>v^v^^><>v>v>^^v<^v<>>^^^^^<v>><v^>^^<v>><v^^>v<^<^>>>^><^^>><<>>^><>^^^>v^^^>^^v^<>^^><^>>><><^>>v<v^>v<^><v<v^<>v<^v>v^<^vv^^><<<><><^v^<v<^^>v>v^>>^^vv^<v>^v>^<^v<>^>^><^<v>^v><^<^<>v^^>^><>>><<v><<><>v<<^v^^<^><>^<><><v>v<^^<v<v>>^^<<>>^<v>><^><^<^>^^v<>v>>><><<>^>v><><<<<v^^^^v<>>^^^v>><<^v>^>>><vv^>>^vv<^<>>^<^^<^v>v<v<<<<<>^<<^<<<<<^<^>>^><<>><>v^v>^<^>v^<><vvv^>^v^v^v><^<v<>vv<<^<>^^^<>^v>^<v^^<v^v>v<>>^>v<<>v<>v^v>v<<<>>v>vv>>v<<>v<>v<^>^>^<v>>v>^>^^^<vv>v<<>>><v>^vvv^^>^^<^vv^^^^>v>^v^>v^^v^>>^v>^vv>^^v^<<<<>^<><^<^<<^^>v^^^v<>>vvv<v>>vv><v<v>^<^v>>^v<vv^<<v<vv><^^v^v>v<>^v<<<^^v^^^<^v>v^v^v>><vvv<<>v<>^v>vv^v>vv<<^v<v>^v>v>><^v<v<>v>>>><<<><vv><>^v^<^vvv>v<>><^v>^>><v>vv<><><>v><>>><^>vv>>^<>v^>>^><<<^><<>^v^>>><><>vv>^<>^>^v^^><^>>><<>v^<^vv>^<^vv>><v<>vv<v><><<^><>v<^^<^>vv^^^^vv<<v><>vv<><v>v<>>>>^><v><>^<><>v<>><<>^^vvv>^^^<><>>vvv^v>><>vv<vv>^^^v^<<>^^v<><<^^v<>^^>^<^^v>>v^v^^>>v>>>^<<^<>^>^^v>>>><vv<<>^v<<vv><<^^vv><^>vv<>>v<v>v^>v>>v^<vv<<<v><v^>vvv^^>vv^<<v>v^>>v^<>>><><<^^<^v>^>>>v>v>^v<>vv><vv<vvv<<v>v>^v<<<>><<><><>v^>>>v^>v^>>vv^^<v>^<>>><^>v^<>^^><v>v<><<<><v^v<<<v<v^>v^v>^>v<^<>v>v^^>>v>vv^v<>>^^^^<>v^>>>>>>>><v<^<<vvv<^v^>^v<^<<>>><<<^<<^>^>v^<>^<<<>v>><^vv^>^>^>>>^<vv><v^^^<v^<v<><v^vvv<>v<vvv^vv<<<v^<^<^vvvv^<<vv<^v><<>^>^<v^v^<^>v^><>>v^>v^>^>>v<>vv^v<<>^^>>vv<>vv>>^v<^vv>^v>v<v^vvv^<<^><>v^<><vv><>v^^><<<><>^>^v^<>><vv<^>v^v>v<>><v<<^>^<vv<^v>^<<v><^<^^vv^<>><v^>^vv^<>>^^^^v>v><^^^v^<<<>^<^<<>><>>v<<^v^>><><v^>>^vv^v>vv>>>>>>^^<<>v^>v^v>^^>>><vv^^^v>^v>>^^^<>><>v^<<<v<vv^^<v^<<<>v>v^^^<vv<>>^v>^v<^<<><>vv>^^^<^^vv<v<<vv>^^>vv>v<<^>^vv><^><v>^^^^v<<vv>v^<<^^>>^^vvvv^v^>vv>>v^<v>vvv<>>^><>>v^^>>^<>>vvvv^>><v^v<^^<^vv>>v<<^<<^><v^^><v^>v^>><<<v>v>v^>^v<v^vv<^^^v<^<vvvvv<<vvv>><>v<v<v<<^v<><<>vv>><v>><^>>^^v>^>><>vv^><<>>vv<<<^<^^>^<<^>>>><v<^v<<<>>v>vv<^>^v><>>v<v^v<>v^vvvv>v^>>v><<^<v>^^v>>vv^^>v>^v>^v^^>^<^vv<v<<^>vv<<^>>^<<^^>>^<^>v^><^vv>^^v><v^>>><>v^v>^v<^><<<>vv><v>v<><>>v^<>^^>^<>^<<^>>vv^><^<v<^^vvv>>v^>>v^>v>vv><>>v<^>><<<v<<vv><v<v<v>v<v>vv^vvv^vv^>^>v><vv<v^^<>>>>vv^>^<>v<^>^<^v>vv<^<<>>^<^<vv><^^<>^<<v^v^>v<<><v>v>><^v<<^vvv>v>v<<^^<^^>v<vv<v<v^v>^^^>^>vv<v<<^^v^<v<^>^^^vv>v<>>>vv>><><^><><<<vvv<<^^v^<v^<<^>>vv>vv^v^>>><v><<v^v>>v>>vv>^^vvv^>^^>^>^>^v<<^vv^>vvv^^vv><^>^v^>^><>v<^^vv<v><v^<><^<>><v>^^v^v>v^vv<>><^v>^<^v>^<>^v>>>><<vv^^^vv^>>><vv^v>>v><^v^vv><<^v<<>^^<v><^v>vvv<><^^><<^v><>^<^v<^^<^vvvv^^>>>>vv>v>>>v<v^><<<<v>>v^><v>>vv^v<vv<>vv<>vvv>>>><>>><>^v<v^v><vvv<<v^^v^v<>>><>>^vv<<v<><<vv<v^>^^vv><^v^v<v^vvv^v>v^^^vv>^><^vvv<<>^vvv^<v<v^v>>>>^<<<><<<<<^v<^^>>>>^>^<v^^^v<vvv<vv^<>v<<<^<^>>v^<v><<><<^^vvv^>v<>>^^>v>^v>>v<v><v>>>>^<^<^>v^v<vv<>^>><>^<<^vvv^^<>^<vvv<>v^>^^<<^>^vv><vvv>>v^v^>v><v>^<^^<>^>^>>>^^vvv^<<>v^<<>><>v<^<^>v^>^vv><v<^<<<^v>^>>^<^v^<<<<^v^><v^v>v^><<v<><<v^<<^<<v<<v><v><><^^^^>v>^^<v>>v<vvv<<<>><>>^><<><^<>>^^>vv<^><^v^><vvv>>>vvv<<vv^<^^^<^>^<>>^>>^v^<^^v>^<v<<>^^v<^vv^><vvv>>^v><<^<v^<><><>>^>vv<<>^^^v^^<v<>><>>vv>v^>vvv^^v<vv<^<^>>^>>^>>v^<<<v^>v^<^v^vv^><^<^v<<v<<>v>^v^<<<v^vv<v<<>^^<v>>>^<v<^>^^v<v>>>><vv<^^<<>><<v<v>^^v^>>^^>>^v^<^v>v^v^v^v^>v^vv<><>^^<>^><^^^<<<^<v>v<<>^<^^^^^v^<^<<^^>^vv<>v^>><>>^>v>v<>^>v<v^>>><>^<><v>>>^>^>>v^><v<>v><^vv^>v<<v>v<><<vv<<v>^><^<v^>v<<v^v<<><v><>v<v><>^^<v<>><<>v>vv<<v>^v<v>vv><><>vv^<<>^>^<^>>>^v>v<^v^^^vv<>>>^<<^>>><<^^v^>v^<^v>vvv>v^^vv>^^>>v<>^<<>^<><^^v^>><>^>v>>^^^<<^^v<>^^>^<>^>><^>^vvv><^>^<^>^>>vv<^>>^v>>^<>>^^>>>v^<v>>v<<v<^>>v^^vv>v><^v^^><vv^v<^>v<<>v^^<><>^>vvv><^^^>^v^>v>>^vvv<^vv>^^>^>>v<>><<^v<<v^>^><>vv^<<^^vv><v>>^<^><^<v>^v<v>^<<>^v^^>v^>>^^^<^vv>v^>>>vv<<>v>>>^>v^^<v^v^^v^>>v<v<<v>^<<>>vv<<^v>v<<vv<<^<^v<^<><^^>v>>v>v^>><vv<^v<^>^>>v>^><<^<<>^v<v>>><^^<^<<<v^^>^>vv<<>^<>^<v^<<^v>vv>^^^v<^v><v<<<<<vv>vv>^^^^>v>v><<^<<<^vv><^<<<><v>><v^v>v<<v^^<v^>v>^v^v^<^<^vv>vvv<^^v<>v<<<<>v<v^<vvv^^^<<^<^<<>^<<><<<>v<^>^^v<^^v^>vv>vvv>v><v^^<<>>^><^>>v<<vv>v<<^^^v<<^v^^><><<<><<>v>^<<>v<<<^v>><v^v<^v<v^vv>v>><<^<><^v^^v<v>^>^>vvvv<<><<>>^<vv>^^><v<>v>v<v^^>^><>>><^><<><<<^<>v^><vv^^^^>>^v^>v^<>>v>^^><^<^v^<v^>>v>^vvv<>>v<v^v><>^vvvv<v^<<v^<<^^vv>><<<<<<v><<<v<v^v^^<v^^<>v<<<<^v<<><<v^<^><v<vv<v^v^<v^^vv<v^v<<<>^<<>vv<v<^>^<<><vv<<vv<v<^<^<>><^^<<>>>vv>>>>>>^v<v<>>v^v^^<v^<<<<>><<^v^^^<>^<vv>>>><>v^v^vvv^>>v>><v^v<<<^v>>^^<<^^vv><<<^^^<<<v><^^>>>>vvv^v<^>^^>v<^<><vv<v<>v>>>^vv<<^<v>^v^>^>^v>v>v^v^>v<<v>><>><v^^<<^>>>><<^v^<>^v<vv><>vvv^>v>v<v<v^>^<><><>^>>><v<<<v^vv><>^>^^<<v^>>v^^>^<v>><>><>v^v^^v>>>>vv>>^v<<^v^<>^>v^^>^^<<vvvvvvv>^<v^<<^<<>><<<^^^v^^^^v<^<>v<^^<>vv^^v^<>^<<^>>v>v<<<^^^^vvv^<^<><>v<<v^<^<>>><<><<<v<v<v><vv>^^<vv<<vv<<<v<^>^^vv<v<>><<>>>^v<<>^>>>v^>v>^^<>^<vv<><^>v>^>>>><>^^>v^^v>^vv^^v^><<<>>v<>v<vv<vv^v^v<^v^<^^><<<><vv^^>^<^<<>v>>>>^<<v>v<v>vv<^><^<v><<^>v>>v><<v<<^v^<>>^>>>^v^v>v^^vv^>^<^^>>^><^vv^^vv^<>>^^^^<^^><><v<>>^>>^><vv^>^vvv<^<<v^^<<<>^><>>>^^<><v<v<><<v^^^^^<^<^<<>><<>>>>^<<>>>^<^v^>><<^>>>^<<v>^>><>^<v>^<><v>^v^^vv<><^>vv^^v^<^^^v^vvv^>><>>v<<vv<>>^<^vvv<<^^><vvv^^<v<>vv^^<<>><v>><^^vvv<<<^>^<><^>vv^><^<<>vv<<v>>vv>v>v^<vv><vv><<>^^^^v^^^^<v>^<<^><><^^v^>v>^>><^><<>v^<v>>>^vvv>>^<^<>^^v^vv^^v><<vv^<>>>v<<<>v>^<>v<<>v^>^<<><<><v<v<v<>v^>v<><^^>^<^v^^><^>vv>^>vv<v<^v>vv>^^><<>vv^>^v<<^<<^<<>v<v<^<v>v>>^><v^^v^v>>>><v^v^<<<vv<<^^<>>v^v<^v>v>^^^v<v><v^^^vv<>v^v<^<>v><><v^<>>vv>v><>v>^v<><<<<<<v<>>v^vv<<<<v<<v><^<>^>><>^^vv>^<^<<>vv>>vv<vvv>><><v<>><^<v>^><^<<v>><v><v>^<v>><>v^^^^v<v^^v<>^^vv<>v<>v>^vv^><v^<<^<>^<>^^^>v^>>>v><<^>>v<^v<>^^<v<><v^v<v>v<><v<vv><<>v<^<^>v<>v^>v>^^<<<^^vv^<><<<>>v>^^<>v>>>><v<v<^^^v<v<v^><<>v^v<>v>><<<<v^<><^<<^>^<vvv<v^^v>>v^vv^><^v^^<>^^><<v^>>vv>^<v^vv<^^v<>>vvv<^v^>>^<v<v>>^>^^<<^>^>^v><>>^<^^v>^>>^^<><>>>^^>^^vvv>v<^^<>v^v^^<v<<^<v^v^<<>v^v<v<<v<>>><<^^^>>v>^vv>^>^^v<>^^<>v^^<><v<v<vvv^<vv<<>v^><<><v<>vv<<^vvvv><<<v>v>v^>v^<>v^>^<v<vvv^>^<>^>^^v<>><<<><v<^^>^v<v>^^v^v<<<^v^<>^<>v>^^>v<v<v>v>^^<<<><<^>v<v<^vv^v><^^<<vv>^<<v><>^>>>>><v^v<<<^>^v^v<<v<>vvv<<>v>v>>^v^v^>><<<<>v^<v<><<>>>^>>^>><<v>
\ No newline at end of file
diff --git a/2015/03/puzzle-1.awk b/2015/03/puzzle-1.awk
new file mode 100644
index 0000000..13b1209
--- /dev/null
+++ b/2015/03/puzzle-1.awk
@@ -0,0 +1,6 @@
+BEGIN     { x = y = 1; homes[x][y] = 1; acc = 1 }
+$0 == "^" { if (!homes[x][++y]++) acc++; next }
+$0 == ">" { if (!homes[++x][y]++) acc++; next }
+$0 == "v" { if (!homes[x][--y]++) acc++; next }
+$0 == "<" { if (!homes[--x][y]++) acc++; next }
+END       { print acc }
diff --git a/2015/03/puzzle-2.awk b/2015/03/puzzle-2.awk
new file mode 100644
index 0000000..0857009
--- /dev/null
+++ b/2015/03/puzzle-2.awk
@@ -0,0 +1,11 @@
+BEGIN			{ sx = sy = rx = ry = 1; homes[sx][sy] = 1; acc = 1 }
+			{ santa = santa ? 0 : 1 }
+santa == 0 && $0 == "^"	{ if (!homes[rx][++ry]++) acc++; next }
+santa == 0 && $0 == ">"	{ if (!homes[++rx][ry]++) acc++; next }
+santa == 0 && $0 == "v"	{ if (!homes[rx][--ry]++) acc++; next }
+santa == 0 && $0 == "<"	{ if (!homes[--rx][ry]++) acc++; next }
+santa == 1 && $0 == "^"	{ if (!homes[sx][++sy]++) acc++; next }
+santa == 1 && $0 == ">"	{ if (!homes[++sx][sy]++) acc++; next }
+santa == 1 && $0 == "v"	{ if (!homes[sx][--sy]++) acc++; next }
+santa == 1 && $0 == "<"	{ if (!homes[--sx][sy]++) acc++; next }
+END			{ print acc }
diff --git a/2015/03/puzzles.sh b/2015/03/puzzles.sh
new file mode 100755
index 0000000..6007df1
--- /dev/null
+++ b/2015/03/puzzles.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+fold -w1 input | awk -f puzzle-1.awk
+fold -w1 input | awk -f puzzle-2.awk
diff --git a/2015/04/.gitignore b/2015/04/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2015/04/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2015/04/Makefile b/2015/04/Makefile
new file mode 100644
index 0000000..10ec8f9
--- /dev/null
+++ b/2015/04/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -lmd -DINPUT=\"$$(cat input)\" -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -lmd -DINPUT=\"$$(cat input)\" -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2015/04/input b/2015/04/input
new file mode 100644
index 0000000..bf3e46f
--- /dev/null
+++ b/2015/04/input
@@ -0,0 +1 @@
+bgvyzdsv
diff --git a/2015/04/puzzles.c b/2015/04/puzzles.c
new file mode 100644
index 0000000..22833a2
--- /dev/null
+++ b/2015/04/puzzles.c
@@ -0,0 +1,35 @@
+#include <sys/types.h>
+
+#include <md5.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER 128
+#ifdef PART2
+	#define ZEROS     "000000"
+	#define NUM_ZEROS 6
+#else
+	#define ZEROS     "00000"
+	#define NUM_ZEROS 5
+#endif
+
+int
+main(void)
+{
+	unsigned int i = 0;
+	char buffer[MD5_DIGEST_STRING_LENGTH], digest[BUFFER];
+	MD5_CTX ctx;
+
+	do {
+		snprintf(digest, BUFFER, INPUT "%u", i);
+
+		MD5Init(&ctx);
+		MD5Update(&ctx, (uint8_t *) digest, strlen(digest));
+		MD5End(&ctx, buffer);
+	} while (strncmp(buffer, ZEROS, NUM_ZEROS) && ++i);
+
+	printf("%u\n", i);
+	return EXIT_SUCCESS;
+}
diff --git a/2015/05/input b/2015/05/input
new file mode 100644
index 0000000..a9b6e77
--- /dev/null
+++ b/2015/05/input
@@ -0,0 +1,1000 @@
+sszojmmrrkwuftyv
+isaljhemltsdzlum
+fujcyucsrxgatisb
+qiqqlmcgnhzparyg
+oijbmduquhfactbc
+jqzuvtggpdqcekgk
+zwqadogmpjmmxijf
+uilzxjythsqhwndh
+gtssqejjknzkkpvw
+wrggegukhhatygfi
+vhtcgqzerxonhsye
+tedlwzdjfppbmtdx
+iuvrelxiapllaxbg
+feybgiimfthtplui
+qxmmcnirvkzfrjwd
+vfarmltinsriqxpu
+oanqfyqirkraesfq
+xilodxfuxphuiiii
+yukhnchvjkfwcbiq
+bdaibcbzeuxqplop
+ivegnnpbiyxqsion
+ybahkbzpditgwdgt
+dmebdomwabxgtctu
+ibtvimgfaeonknoh
+jsqraroxudetmfyw
+dqdbcwtpintfcvuz
+tiyphjunlxddenpj
+fgqwjgntxagidhah
+nwenhxmakxqkeehg
+zdoheaxqpcnlhnen
+tfetfqojqcdzlpbm
+qpnxkuldeiituggg
+xwttlbdwxohahwar
+hjkwzadmtrkegzye
+koksqrqcfwcaxeof
+wulwmrptktliyxeq
+gyufbedqhhyqgqzj
+txpunzodohikzlmj
+jloqfuejfkemcrvu
+amnflshcheuddqtc
+pdvcsduggcogbiia
+yrioavgfmeafjpcz
+uyhbtmbutozzqfvq
+mwhgfwsgyuwcdzik
+auqylgxhmullxpaa
+lgelzivplaeoivzh
+uyvcepielfcmswoa
+qhirixgwkkccuzlp
+zoonniyosmkeejfg
+iayfetpixkedyana
+ictqeyzyqswdskiy
+ejsgqteafvmorwxe
+lhaiqrlqqwfbrqdx
+ydjyboqwhfpqfydc
+dwhttezyanrnbybv
+edgzkqeqkyojowvr
+rmjfdwsqamjqehdq
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diff --git a/2015/05/puzzle-1.sed b/2015/05/puzzle-1.sed
new file mode 100644
index 0000000..9cba7ad
--- /dev/null
+++ b/2015/05/puzzle-1.sed
@@ -0,0 +1,3 @@
+/ab\|cd\|pq\|xy/d
+/\(.\)\1/!d
+/\(.*[aeiou].*\)\{3\}/p
diff --git a/2015/05/puzzle-2.sed b/2015/05/puzzle-2.sed
new file mode 100644
index 0000000..908afdf
--- /dev/null
+++ b/2015/05/puzzle-2.sed
@@ -0,0 +1,2 @@
+/\(.\).\1/!d
+/\(..\).*\1/p
diff --git a/2015/05/puzzles.sh b/2015/05/puzzles.sh
new file mode 100755
index 0000000..57ddb11
--- /dev/null
+++ b/2015/05/puzzles.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+
+# Could do this with just grep(1) and skip using wc(1), but I am lazy
+
+sed -nf puzzle-1.sed input | wc -l
+sed -nf puzzle-2.sed input | wc -l
diff --git a/2015/06/input b/2015/06/input
new file mode 100644
index 0000000..495311e
--- /dev/null
+++ b/2015/06/input
@@ -0,0 +1,300 @@
+turn off 660,55 through 986,197
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diff --git a/2015/06/puzzle-1.awk b/2015/06/puzzle-1.awk
new file mode 100755
index 0000000..97165cf
--- /dev/null
+++ b/2015/06/puzzle-1.awk
@@ -0,0 +1,15 @@
+#!/usr/bin/env -S awk -f
+
+function setlights(val, toggle)
+{
+	for (i = from[1]; i <= to[1]; i++) {
+		for (j = from[2]; j <= to[2]; j++)
+			lights[i][j] = toggle ? (lights[i][j] ? 0 : 1) : val
+	}
+}
+
+$1 == "toggle" { split($2, from, ","); split($4, to, ","); setlights(0, 1) }
+$2 ~ /on|off/  { split($3, from, ","); split($5, to, ",") }
+$2 == "on"     { setlights(1, 0) }
+$2 == "off"    { setlights(0, 0) }
+END            { for (i = 0; i <= 999; i++) for (j = 0; j <= 999; j++) count += lights[i][j]; print count }
diff --git a/2015/06/puzzle-2.awk b/2015/06/puzzle-2.awk
new file mode 100755
index 0000000..97ae1f8
--- /dev/null
+++ b/2015/06/puzzle-2.awk
@@ -0,0 +1,17 @@
+#!/usr/bin/env -S awk -f
+
+function setlights(val)
+{
+	for (i = from[1]; i <= to[1]; i++) {
+		for (j = from[2]; j <= to[2]; j++) {
+			if (!(val == -1 && lights[i][j] == 0))
+				lights[i][j] += val
+		}
+	}
+}
+
+$1 == "toggle" { split($2, from, ","); split($4, to, ","); setlights(2) }
+$2 ~ /on|off/  { split($3, from, ","); split($5, to, ",") }
+$2 == "on"     { setlights(1) }
+$2 == "off"    { setlights(-1) }
+END            { for (i = 0; i <= 999; i++) for (j = 0; j <= 999; j++) count += lights[i][j]; print count }
diff --git a/2015/08/input b/2015/08/input
new file mode 100644
index 0000000..94538e7
--- /dev/null
+++ b/2015/08/input
@@ -0,0 +1,300 @@
+"qxfcsmh"
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diff --git a/2015/08/puzzle-1.sh b/2015/08/puzzle-1.sh
new file mode 100755
index 0000000..ee35d69
--- /dev/null
+++ b/2015/08/puzzle-1.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+X=$(tr -d '\n' <input | wc -c)
+Y=$(sed 's/\(^"\|"$\)//g; s/\\x[a-f0-9]\{2\}/./g; s/\\[\\"]/./g' input \
+	| tr -d '\n' \
+	| wc -c)
+expr $X - $Y
diff --git a/2015/08/puzzle-2.sh b/2015/08/puzzle-2.sh
new file mode 100755
index 0000000..a00f13f
--- /dev/null
+++ b/2015/08/puzzle-2.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+X=$(sed 's/\("\|\\\)/\\&/g; s/^/../' input \
+	| tr -d '\n' \
+	| wc -c)
+Y=$(tr -d '\n' <input | wc -c)
+expr $X - $Y
diff --git a/2015/10/.gitignore b/2015/10/.gitignore
new file mode 100644
index 0000000..3971a19
--- /dev/null
+++ b/2015/10/.gitignore
@@ -0,0 +1,2 @@
+puzzle-[12]
+tmp[12].go
diff --git a/2015/10/Makefile b/2015/10/Makefile
new file mode 100644
index 0000000..8d258e1
--- /dev/null
+++ b/2015/10/Makefile
@@ -0,0 +1,12 @@
+all:
+	m4 -D INPUT=\"$$(cat input)\" -D LOOPS=40 -U len puzzles.go >tmp1.go
+	m4 -D INPUT=\"$$(cat input)\" -D LOOPS=50 -U len puzzles.go >tmp2.go
+	go build tmp1.go
+	go build tmp2.go
+	mv tmp1 puzzle-1
+	mv tmp2 puzzle-2
+	rm tmp[12].go
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12] tmp[12].go
diff --git a/2015/10/README b/2015/10/README
new file mode 100644
index 0000000..1102d82
--- /dev/null
+++ b/2015/10/README
@@ -0,0 +1,10 @@
+======
+ NOTE
+======
+
+I did not come up with the shell script solution myself, that is why I also included the very slow
+Go solution. The shell script solution comes from this Reddit post:
+
+	https://www.reddit.com/r/adventofcode/comments/3w6h3m/comment/cxtsigs/
+
+I felt that this solution was just too epic, so I included it here.
diff --git a/2015/10/input b/2015/10/input
new file mode 100644
index 0000000..13dcd63
--- /dev/null
+++ b/2015/10/input
@@ -0,0 +1 @@
+3113322113
diff --git a/2015/10/puzzles.go b/2015/10/puzzles.go
new file mode 100644
index 0000000..65de02f
--- /dev/null
+++ b/2015/10/puzzles.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func process(num string) string {
+	var newnum string
+
+	for i := 0; i < len(num); {
+		c := num[i]
+		j := 0
+		for i < len(num) && num[i] == c {
+			i++
+			j++
+		}
+		newnum += strconv.Itoa(j)
+		newnum = string(append([]byte(newnum), c))
+	}
+
+	return newnum
+}
+
+func main() {
+	num := INPUT
+	for i := 0; i < LOOPS; i++ {
+		num = process(num)
+	}
+	fmt.Println(len(num))
+}
diff --git a/2015/10/puzzles.sh b/2015/10/puzzles.sh
new file mode 100755
index 0000000..291ac96
--- /dev/null
+++ b/2015/10/puzzles.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env sh
+
+output()
+{
+	echo $in | tr -d '\n' | wc -c
+}
+
+in=$(cat input)
+for i in $(seq 1 50); do
+	in=$(echo "$in" | fold -w1 | uniq -c | tr -d '\n ')
+	[ $i -eq 40 ] && output
+done
+output
diff --git a/2015/11/input b/2015/11/input
new file mode 100644
index 0000000..a45c477
--- /dev/null
+++ b/2015/11/input
@@ -0,0 +1 @@
+hepxcrrq
diff --git a/2015/11/puzzle-1 b/2015/11/puzzle-1
new file mode 100644
index 0000000..b0e5756
--- /dev/null
+++ b/2015/11/puzzle-1
@@ -0,0 +1,7 @@
+The starting string is "hepxcrrq"
+
+The string must contain two sets of non-overlapping duplicates, this is best done as having the last
+5 characters be "xxyzz". The first 3 characters aren't illegal, so we don't need to change them.
+This gives an end result of "hepxxyzz".
+
+QED. (I hope)
diff --git a/2015/11/puzzle-2 b/2015/11/puzzle-2
new file mode 100644
index 0000000..444ce35
--- /dev/null
+++ b/2015/11/puzzle-2
@@ -0,0 +1,9 @@
+This continues from the last puzzle, so our starting string is "hepxxyzz"
+
+Following the theme of the previous puzzle, we want to create an "xxyzz" pattern in the lowest
+amount of increments possible. Since the string currently ends in "xxyzz", we know that the next
+possible value we could have that satisfies this property is "aabcc". In order to go from "xxyzz" to
+"aabcc" however, you need to overflow which would increment the "p" to a "q". This gives an end
+result of "heqaabcc".
+
+QED.
diff --git a/2015/12/input b/2015/12/input
new file mode 100644
index 0000000..bd91fda
--- /dev/null
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diff --git a/2015/12/puzzle-1.sh b/2015/12/puzzle-1.sh
new file mode 100755
index 0000000..7b509fe
--- /dev/null
+++ b/2015/12/puzzle-1.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+tr -c '\-0-9' '\n' <input | squash | paste -sd+ | bc
diff --git a/2015/12/puzzle-2.sh b/2015/12/puzzle-2.sh
new file mode 100755
index 0000000..e97fc8a
--- /dev/null
+++ b/2015/12/puzzle-2.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+jq 'walk(if type == "object" then del(select(.[] == "red")) end)' input \
+	| tr -c '\-0-9' '\n' \
+	| squash \
+	| paste -sd+ \
+	| bc
diff --git a/2015/14/input b/2015/14/input
new file mode 100644
index 0000000..2af1170
--- /dev/null
+++ b/2015/14/input
@@ -0,0 +1,9 @@
+Vixen can fly 19 km/s for 7 seconds, but then must rest for 124 seconds.
+Rudolph can fly 3 km/s for 15 seconds, but then must rest for 28 seconds.
+Donner can fly 19 km/s for 9 seconds, but then must rest for 164 seconds.
+Blitzen can fly 19 km/s for 9 seconds, but then must rest for 158 seconds.
+Comet can fly 13 km/s for 7 seconds, but then must rest for 82 seconds.
+Cupid can fly 25 km/s for 6 seconds, but then must rest for 145 seconds.
+Dasher can fly 14 km/s for 3 seconds, but then must rest for 38 seconds.
+Dancer can fly 3 km/s for 16 seconds, but then must rest for 37 seconds.
+Prancer can fly 25 km/s for 6 seconds, but then must rest for 143 seconds.
diff --git a/2015/14/puzzle-1.bc b/2015/14/puzzle-1.bc
new file mode 100644
index 0000000..d36cafd
--- /dev/null
+++ b/2015/14/puzzle-1.bc
@@ -0,0 +1,25 @@
+/* Return the largest element from array `a` of length `l` */
+define max(a[], l)
+{
+	auto m, i
+	for (i = 0; i < l; i++) {
+		if (a[i] > m)
+			m = a[i]
+	}
+	return m
+}
+
+/* Return the kilometers traveled by a raindeer that flys with speed `s` km/s for `t` seconds before
+ * needing to rest for `r` seconds.
+ */
+define calc(s, t, r)
+{
+	auto a, d
+	while (d + t <= 2503) {
+		a += s * t
+		d += t + r
+	}
+	if (d < 2503)
+		a += s * (2503 - d)
+	return a
+}
diff --git a/2015/14/puzzle-2.bc b/2015/14/puzzle-2.bc
new file mode 100644
index 0000000..4a41277
--- /dev/null
+++ b/2015/14/puzzle-2.bc
@@ -0,0 +1,33 @@
+scale = 0
+
+/* Return the largest element from array `a` of length `l` */
+define max(a[], l)
+{
+	auto m, i
+	for (i = 0; i < l; i++) {
+		if (a[i] > m)
+			m = a[i]
+	}
+	return m
+}
+
+define calc(speed[], time[], rest[], n)
+{
+	auto i, j, k, p[], d[]
+	
+	for (i = 0; i < 2503; i++) {
+		for (j = k = 0; j < n; j++) {
+			if (i % (time[j] + rest[j]) < time[j])
+				d[j] += speed[j]
+			if (d[j] > k)
+				k = d[j]
+		}
+
+		for (j = 0; j < n; j++) {
+			if (d[j] == k)
+				p[j] += 1
+		}
+	}
+
+	return max(p[], n)
+}
diff --git a/2015/14/puzzles.sh b/2015/14/puzzles.sh
new file mode 100755
index 0000000..b55642d
--- /dev/null
+++ b/2015/14/puzzles.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env sh
+
+# I use bc-gh(1), but it's just Gavin Howards implementation of bc(1)
+
+sed -e 's|[^0-9]*\([0-9]*\)[^0-9]*\([0-9]*\)[^0-9]*\([0-9]*\).*|x[y++] = calc(\1, \2, \3)|' \
+    -e '$amax(x[], y)' input \
+	| bc-gh -q puzzle-1.bc
+
+sed -e 's|[^0-9]*\([0-9]*\)[^0-9]*\([0-9]*\)[^0-9]*\([0-9]*\).*|speed[n] = \1; time[n] = \2; rest[n++] = \3|' \
+    -e '$acalc(speed[], time[], rest[], n)' input \
+	| bc-gh -q puzzle-2.bc
diff --git a/2015/15/input b/2015/15/input
new file mode 100644
index 0000000..d1af06e
--- /dev/null
+++ b/2015/15/input
@@ -0,0 +1,4 @@
+Sugar: capacity 3, durability 0, flavor 0, texture -3, calories 2
+Sprinkles: capacity -3, durability 3, flavor 0, texture 0, calories 9
+Candy: capacity -1, durability 0, flavor 4, texture 0, calories 1
+Chocolate: capacity 0, durability 0, flavor -2, texture 2, calories 8
diff --git a/2015/15/puzzle-1.py b/2015/15/puzzle-1.py
new file mode 100755
index 0000000..806737c
--- /dev/null
+++ b/2015/15/puzzle-1.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+from math import prod
+import itertools
+import re
+
+
+def main() -> None:
+	data: list[list[int]] = []
+	with open("input", "r", encoding="utf-8") as f:
+		for line in f.readlines():
+			m = re.match(
+				r"[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)",
+				line,
+			)
+			data.append([int(m.group(1)), int(m.group(2)), int(m.group(3)), int(m.group(4))])
+
+	total: int = 0
+	for i in range(100):
+		for j in range(100 - i):
+			for k in range(100 - i - j):
+				if i + j + k > 100:
+					continue
+				h = 100 - i - j - k
+
+				parts: list[int] = []
+				parts.append(data[0][0] * i + data[1][0] * j + data[2][0] * k + data[3][0] * h)
+				parts.append(data[0][1] * i + data[1][1] * j + data[2][1] * k + data[3][1] * h)
+				parts.append(data[0][2] * i + data[1][2] * j + data[2][2] * k + data[3][2] * h)
+				parts.append(data[0][3] * i + data[1][3] * j + data[2][3] * k + data[3][3] * h)
+
+				if not any(map(lambda x: x < 0, parts)):
+					total = max(total, prod(parts))
+
+	print(total)
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2015/15/puzzle-2.py b/2015/15/puzzle-2.py
new file mode 100755
index 0000000..ec03a82
--- /dev/null
+++ b/2015/15/puzzle-2.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+from math import prod
+import itertools
+import re
+
+
+def main() -> None:
+	data: list[list[int]] = []
+	with open("input", "r", encoding="utf-8") as f:
+		for line in f.readlines():
+			m = re.match(
+				r"[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)[^\-0-9]+([\-0-9]+)[^\-0-9]+([0-9]+)",
+				line,
+			)
+			data.append(list(map(int, [m.group(i) for i in range(1, 6)])))
+
+	total: int = 0
+	for i in range(100):
+		for j in range(100 - i):
+			for k in range(100 - i - j):
+				if i + j + k > 100:
+					continue
+				h = 100 - i - j - k
+				if data[0][4] * i + data[1][4] * j + data[2][4] * k + data[3][4] * h != 500:
+					continue
+
+				parts: list[int] = []
+				parts.append(data[0][0] * i + data[1][0] * j + data[2][0] * k + data[3][0] * h)
+				parts.append(data[0][1] * i + data[1][1] * j + data[2][1] * k + data[3][1] * h)
+				parts.append(data[0][2] * i + data[1][2] * j + data[2][2] * k + data[3][2] * h)
+				parts.append(data[0][3] * i + data[1][3] * j + data[2][3] * k + data[3][3] * h)
+
+				if not any(map(lambda x: x < 0, parts)):
+					total = max(total, prod(parts))
+
+	print(total)
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2015/16/input b/2015/16/input
new file mode 100644
index 0000000..ddaeefc
--- /dev/null
+++ b/2015/16/input
@@ -0,0 +1,500 @@
+Sue 1: cars: 9, akitas: 3, goldfish: 0
+Sue 2: akitas: 9, children: 3, samoyeds: 9
+Sue 3: trees: 6, cars: 6, children: 4
+Sue 4: trees: 4, vizslas: 4, goldfish: 9
+Sue 5: akitas: 9, vizslas: 7, cars: 5
+Sue 6: vizslas: 6, goldfish: 6, akitas: 3
+Sue 7: pomeranians: 5, samoyeds: 0, perfumes: 10
+Sue 8: cars: 10, pomeranians: 7, goldfish: 8
+Sue 9: trees: 2, vizslas: 7, samoyeds: 6
+Sue 10: perfumes: 5, pomeranians: 4, children: 9
+Sue 11: vizslas: 5, perfumes: 8, cars: 10
+Sue 12: children: 10, cars: 6, perfumes: 5
+Sue 13: cats: 4, samoyeds: 7, pomeranians: 8
+Sue 14: perfumes: 6, goldfish: 10, children: 7
+Sue 15: perfumes: 4, pomeranians: 3, cars: 6
+Sue 16: perfumes: 7, cars: 9, pomeranians: 6
+Sue 17: goldfish: 3, cars: 6, vizslas: 7
+Sue 18: perfumes: 6, cars: 7, goldfish: 3
+Sue 19: trees: 0, akitas: 3, pomeranians: 8
+Sue 20: goldfish: 6, trees: 2, akitas: 6
+Sue 21: pomeranians: 9, akitas: 9, samoyeds: 9
+Sue 22: vizslas: 2, cars: 9, perfumes: 5
+Sue 23: goldfish: 10, samoyeds: 8, children: 9
+Sue 24: akitas: 4, goldfish: 1, vizslas: 5
+Sue 25: goldfish: 10, trees: 8, perfumes: 6
+Sue 26: vizslas: 5, akitas: 8, trees: 1
+Sue 27: trees: 3, cars: 6, perfumes: 2
+Sue 28: goldfish: 8, trees: 7, akitas: 10
+Sue 29: children: 5, trees: 1, goldfish: 10
+Sue 30: vizslas: 3, perfumes: 8, akitas: 3
+Sue 31: cars: 6, children: 10, perfumes: 7
+Sue 32: cars: 10, perfumes: 3, goldfish: 10
+Sue 33: perfumes: 9, vizslas: 3, akitas: 4
+Sue 34: perfumes: 10, vizslas: 7, children: 8
+Sue 35: cars: 5, perfumes: 5, vizslas: 9
+Sue 36: trees: 9, cars: 9, akitas: 7
+Sue 37: samoyeds: 9, perfumes: 2, cars: 10
+Sue 38: akitas: 7, cars: 5, trees: 5
+Sue 39: goldfish: 8, trees: 9, cars: 10
+Sue 40: trees: 0, cats: 1, pomeranians: 1
+Sue 41: pomeranians: 6, perfumes: 9, samoyeds: 1
+Sue 42: vizslas: 6, akitas: 3, pomeranians: 1
+Sue 43: vizslas: 2, perfumes: 3, pomeranians: 6
+Sue 44: akitas: 5, pomeranians: 0, vizslas: 10
+Sue 45: vizslas: 4, goldfish: 1, cars: 5
+Sue 46: cars: 4, vizslas: 8, cats: 0
+Sue 47: cats: 5, children: 8, pomeranians: 2
+Sue 48: vizslas: 3, perfumes: 6, cats: 0
+Sue 49: akitas: 7, perfumes: 0, trees: 7
+Sue 50: trees: 4, akitas: 10, vizslas: 2
+Sue 51: goldfish: 10, cars: 9, trees: 4
+Sue 52: cars: 5, children: 9, perfumes: 0
+Sue 53: vizslas: 5, cars: 3, cats: 8
+Sue 54: cars: 5, akitas: 1, goldfish: 10
+Sue 55: akitas: 10, vizslas: 2, cars: 6
+Sue 56: cats: 6, trees: 0, cars: 4
+Sue 57: vizslas: 1, akitas: 1, samoyeds: 7
+Sue 58: samoyeds: 6, vizslas: 1, akitas: 7
+Sue 59: akitas: 9, cars: 8, vizslas: 1
+Sue 60: cars: 6, vizslas: 7, goldfish: 0
+Sue 61: pomeranians: 5, akitas: 6, vizslas: 2
+Sue 62: samoyeds: 2, cats: 8, goldfish: 7
+Sue 63: vizslas: 10, goldfish: 7, samoyeds: 9
+Sue 64: perfumes: 2, trees: 1, akitas: 6
+Sue 65: cars: 8, perfumes: 10, vizslas: 9
+Sue 66: akitas: 8, vizslas: 8, perfumes: 8
+Sue 67: goldfish: 7, cars: 9, samoyeds: 9
+Sue 68: perfumes: 2, children: 7, akitas: 1
+Sue 69: perfumes: 7, vizslas: 9, akitas: 1
+Sue 70: samoyeds: 3, vizslas: 1, trees: 1
+Sue 71: vizslas: 8, goldfish: 7, trees: 9
+Sue 72: goldfish: 8, cars: 6, trees: 9
+Sue 73: perfumes: 5, cars: 10, samoyeds: 7
+Sue 74: pomeranians: 4, perfumes: 3, cars: 5
+Sue 75: samoyeds: 1, perfumes: 1, pomeranians: 1
+Sue 76: goldfish: 4, cats: 6, akitas: 7
+Sue 77: perfumes: 5, akitas: 4, vizslas: 8
+Sue 78: perfumes: 4, cats: 3, children: 4
+Sue 79: vizslas: 5, pomeranians: 9, samoyeds: 7
+Sue 80: cars: 3, samoyeds: 5, pomeranians: 7
+Sue 81: vizslas: 2, samoyeds: 4, perfumes: 2
+Sue 82: trees: 1, akitas: 10, vizslas: 9
+Sue 83: vizslas: 0, akitas: 2, samoyeds: 5
+Sue 84: perfumes: 5, vizslas: 7, children: 8
+Sue 85: cats: 3, children: 2, trees: 0
+Sue 86: cars: 3, perfumes: 2, goldfish: 2
+Sue 87: trees: 1, akitas: 7, vizslas: 0
+Sue 88: trees: 1, akitas: 2, samoyeds: 1
+Sue 89: cars: 4, vizslas: 8, akitas: 1
+Sue 90: perfumes: 5, cats: 3, vizslas: 0
+Sue 91: samoyeds: 7, cats: 6, goldfish: 8
+Sue 92: samoyeds: 10, cats: 0, cars: 7
+Sue 93: cars: 6, akitas: 7, samoyeds: 2
+Sue 94: perfumes: 0, goldfish: 6, trees: 9
+Sue 95: cars: 6, pomeranians: 2, samoyeds: 8
+Sue 96: cars: 2, trees: 9, samoyeds: 4
+Sue 97: goldfish: 5, trees: 1, children: 0
+Sue 98: akitas: 9, goldfish: 7, children: 6
+Sue 99: goldfish: 9, akitas: 0, pomeranians: 0
+Sue 100: samoyeds: 6, children: 8, vizslas: 5
+Sue 101: vizslas: 6, cars: 5, goldfish: 4
+Sue 102: vizslas: 6, akitas: 2, perfumes: 6
+Sue 103: samoyeds: 3, akitas: 7, children: 4
+Sue 104: cars: 3, perfumes: 10, cats: 6
+Sue 105: vizslas: 9, pomeranians: 0, cars: 1
+Sue 106: cats: 6, samoyeds: 8, pomeranians: 5
+Sue 107: cars: 7, trees: 4, akitas: 10
+Sue 108: perfumes: 3, vizslas: 1, goldfish: 9
+Sue 109: trees: 6, cars: 8, goldfish: 5
+Sue 110: pomeranians: 2, children: 1, vizslas: 7
+Sue 111: akitas: 0, vizslas: 8, cars: 0
+Sue 112: goldfish: 3, vizslas: 6, akitas: 2
+Sue 113: akitas: 10, pomeranians: 7, perfumes: 7
+Sue 114: cars: 10, cats: 2, vizslas: 8
+Sue 115: akitas: 8, trees: 1, vizslas: 2
+Sue 116: vizslas: 2, akitas: 7, perfumes: 1
+Sue 117: goldfish: 0, vizslas: 10, trees: 9
+Sue 118: trees: 3, cars: 0, goldfish: 0
+Sue 119: perfumes: 7, goldfish: 5, trees: 9
+Sue 120: children: 9, vizslas: 3, trees: 5
+Sue 121: vizslas: 1, goldfish: 7, akitas: 10
+Sue 122: perfumes: 1, cars: 6, trees: 1
+Sue 123: akitas: 2, vizslas: 0, goldfish: 7
+Sue 124: vizslas: 10, pomeranians: 7, akitas: 0
+Sue 125: perfumes: 4, cats: 5, vizslas: 2
+Sue 126: cars: 6, samoyeds: 8, akitas: 3
+Sue 127: trees: 9, goldfish: 7, akitas: 9
+Sue 128: cars: 8, trees: 0, perfumes: 2
+Sue 129: pomeranians: 7, vizslas: 2, perfumes: 6
+Sue 130: vizslas: 9, pomeranians: 3, trees: 6
+Sue 131: vizslas: 7, cars: 9, perfumes: 1
+Sue 132: akitas: 2, pomeranians: 9, vizslas: 7
+Sue 133: trees: 9, pomeranians: 10, samoyeds: 0
+Sue 134: children: 4, akitas: 10, perfumes: 4
+Sue 135: vizslas: 1, cats: 1, trees: 8
+Sue 136: samoyeds: 7, cars: 8, goldfish: 5
+Sue 137: perfumes: 0, children: 1, pomeranians: 10
+Sue 138: vizslas: 4, perfumes: 5, cars: 5
+Sue 139: trees: 2, perfumes: 8, goldfish: 0
+Sue 140: cars: 10, akitas: 5, goldfish: 7
+Sue 141: children: 4, trees: 3, goldfish: 8
+Sue 142: cars: 8, perfumes: 6, trees: 7
+Sue 143: akitas: 6, goldfish: 0, trees: 10
+Sue 144: akitas: 7, pomeranians: 10, perfumes: 10
+Sue 145: trees: 10, vizslas: 3, goldfish: 4
+Sue 146: samoyeds: 4, akitas: 3, perfumes: 6
+Sue 147: akitas: 8, perfumes: 2, pomeranians: 10
+Sue 148: cars: 2, perfumes: 0, goldfish: 8
+Sue 149: goldfish: 6, akitas: 7, perfumes: 6
+Sue 150: cars: 2, pomeranians: 5, perfumes: 4
+Sue 151: goldfish: 1, cars: 5, trees: 0
+Sue 152: pomeranians: 4, cars: 7, children: 1
+Sue 153: goldfish: 8, cars: 1, children: 10
+Sue 154: cars: 6, perfumes: 8, trees: 1
+Sue 155: akitas: 4, perfumes: 6, pomeranians: 2
+Sue 156: pomeranians: 5, cars: 4, akitas: 1
+Sue 157: cats: 5, cars: 9, goldfish: 8
+Sue 158: vizslas: 5, samoyeds: 1, children: 7
+Sue 159: vizslas: 1, perfumes: 3, akitas: 1
+Sue 160: goldfish: 10, pomeranians: 9, perfumes: 5
+Sue 161: samoyeds: 3, trees: 7, cars: 2
+Sue 162: cars: 2, pomeranians: 1, vizslas: 6
+Sue 163: vizslas: 3, perfumes: 5, akitas: 6
+Sue 164: vizslas: 1, trees: 0, akitas: 5
+Sue 165: vizslas: 5, cars: 6, pomeranians: 8
+Sue 166: cars: 10, perfumes: 2, trees: 9
+Sue 167: cars: 10, pomeranians: 6, perfumes: 4
+Sue 168: akitas: 7, trees: 10, goldfish: 7
+Sue 169: akitas: 1, perfumes: 10, cars: 10
+Sue 170: akitas: 5, samoyeds: 8, vizslas: 6
+Sue 171: children: 3, akitas: 2, vizslas: 3
+Sue 172: goldfish: 5, vizslas: 5, perfumes: 9
+Sue 173: perfumes: 5, goldfish: 10, trees: 5
+Sue 174: akitas: 5, vizslas: 2, children: 7
+Sue 175: perfumes: 5, cars: 7, samoyeds: 2
+Sue 176: cars: 8, vizslas: 10, akitas: 7
+Sue 177: perfumes: 7, children: 8, goldfish: 7
+Sue 178: cars: 1, pomeranians: 9, samoyeds: 0
+Sue 179: perfumes: 6, cars: 2, trees: 6
+Sue 180: trees: 3, vizslas: 7, children: 3
+Sue 181: vizslas: 8, samoyeds: 2, trees: 9
+Sue 182: perfumes: 3, cats: 1, children: 5
+Sue 183: akitas: 9, cats: 6, children: 3
+Sue 184: pomeranians: 9, cars: 6, perfumes: 8
+Sue 185: vizslas: 9, trees: 0, akitas: 9
+Sue 186: perfumes: 6, cars: 5, goldfish: 5
+Sue 187: perfumes: 4, cats: 7, vizslas: 2
+Sue 188: akitas: 7, cars: 4, children: 10
+Sue 189: akitas: 0, goldfish: 7, vizslas: 5
+Sue 190: akitas: 5, cars: 5, cats: 6
+Sue 191: cars: 6, children: 0, perfumes: 3
+Sue 192: cats: 2, perfumes: 10, goldfish: 7
+Sue 193: trees: 1, perfumes: 0, cars: 8
+Sue 194: perfumes: 9, children: 4, cats: 6
+Sue 195: akitas: 7, trees: 3, goldfish: 6
+Sue 196: goldfish: 8, cars: 8, samoyeds: 0
+Sue 197: cats: 0, akitas: 10, vizslas: 0
+Sue 198: goldfish: 1, perfumes: 3, cars: 8
+Sue 199: akitas: 10, vizslas: 5, samoyeds: 6
+Sue 200: pomeranians: 9, goldfish: 9, samoyeds: 7
+Sue 201: samoyeds: 0, goldfish: 7, akitas: 6
+Sue 202: vizslas: 0, goldfish: 2, akitas: 1
+Sue 203: goldfish: 3, children: 0, vizslas: 8
+Sue 204: cars: 8, trees: 2, perfumes: 2
+Sue 205: cars: 4, perfumes: 5, goldfish: 8
+Sue 206: vizslas: 3, trees: 2, akitas: 1
+Sue 207: cars: 7, goldfish: 5, trees: 1
+Sue 208: goldfish: 1, cars: 6, vizslas: 8
+Sue 209: cats: 4, trees: 1, children: 0
+Sue 210: cats: 10, children: 0, perfumes: 0
+Sue 211: cars: 4, pomeranians: 7, samoyeds: 5
+Sue 212: cars: 2, pomeranians: 10, trees: 1
+Sue 213: trees: 10, cats: 5, cars: 10
+Sue 214: perfumes: 5, trees: 1, vizslas: 1
+Sue 215: akitas: 10, vizslas: 8, samoyeds: 8
+Sue 216: vizslas: 2, cats: 5, pomeranians: 3
+Sue 217: akitas: 10, perfumes: 0, cats: 10
+Sue 218: trees: 8, cats: 5, vizslas: 2
+Sue 219: goldfish: 10, perfumes: 8, children: 2
+Sue 220: samoyeds: 9, trees: 8, vizslas: 7
+Sue 221: children: 7, trees: 6, cars: 6
+Sue 222: cats: 4, akitas: 5, pomeranians: 0
+Sue 223: trees: 8, goldfish: 2, perfumes: 8
+Sue 224: pomeranians: 9, cars: 8, akitas: 5
+Sue 225: akitas: 10, vizslas: 0, trees: 2
+Sue 226: akitas: 8, cats: 6, cars: 7
+Sue 227: trees: 1, akitas: 3, goldfish: 4
+Sue 228: pomeranians: 6, cats: 3, goldfish: 3
+Sue 229: trees: 10, perfumes: 3, vizslas: 7
+Sue 230: perfumes: 8, cars: 7, akitas: 0
+Sue 231: perfumes: 10, goldfish: 4, cars: 6
+Sue 232: goldfish: 7, trees: 3, cats: 2
+Sue 233: perfumes: 6, trees: 4, akitas: 4
+Sue 234: goldfish: 9, cats: 4, cars: 7
+Sue 235: pomeranians: 6, vizslas: 0, akitas: 6
+Sue 236: samoyeds: 5, cars: 5, children: 4
+Sue 237: vizslas: 10, cars: 4, goldfish: 4
+Sue 238: goldfish: 3, samoyeds: 7, akitas: 2
+Sue 239: cats: 8, children: 2, vizslas: 7
+Sue 240: cars: 9, perfumes: 4, trees: 9
+Sue 241: trees: 8, vizslas: 2, goldfish: 5
+Sue 242: cars: 6, trees: 3, vizslas: 3
+Sue 243: cats: 6, children: 7, cars: 4
+Sue 244: cats: 10, perfumes: 2, goldfish: 7
+Sue 245: akitas: 8, cats: 10, perfumes: 8
+Sue 246: vizslas: 8, akitas: 5, perfumes: 10
+Sue 247: goldfish: 2, vizslas: 5, akitas: 7
+Sue 248: akitas: 3, perfumes: 0, trees: 10
+Sue 249: cats: 4, vizslas: 5, pomeranians: 6
+Sue 250: children: 3, vizslas: 7, perfumes: 2
+Sue 251: cars: 0, pomeranians: 10, perfumes: 0
+Sue 252: akitas: 0, goldfish: 9, cars: 6
+Sue 253: perfumes: 7, cars: 4, samoyeds: 5
+Sue 254: akitas: 9, trees: 10, cars: 4
+Sue 255: samoyeds: 10, children: 6, akitas: 7
+Sue 256: trees: 8, goldfish: 8, perfumes: 8
+Sue 257: goldfish: 3, akitas: 2, perfumes: 6
+Sue 258: cats: 7, trees: 0, vizslas: 1
+Sue 259: perfumes: 7, cars: 7, akitas: 7
+Sue 260: goldfish: 0, vizslas: 0, samoyeds: 2
+Sue 261: vizslas: 2, children: 2, cats: 3
+Sue 262: vizslas: 2, pomeranians: 9, samoyeds: 3
+Sue 263: cats: 1, akitas: 3, vizslas: 1
+Sue 264: pomeranians: 10, trees: 2, goldfish: 7
+Sue 265: samoyeds: 5, trees: 7, perfumes: 4
+Sue 266: perfumes: 10, cars: 1, pomeranians: 3
+Sue 267: trees: 6, goldfish: 1, cars: 0
+Sue 268: cars: 6, samoyeds: 4, pomeranians: 5
+Sue 269: goldfish: 3, vizslas: 3, akitas: 3
+Sue 270: children: 5, cats: 0, cars: 4
+Sue 271: goldfish: 3, perfumes: 8, pomeranians: 7
+Sue 272: samoyeds: 6, cars: 7, perfumes: 10
+Sue 273: trees: 4, cars: 2, vizslas: 7
+Sue 274: samoyeds: 10, perfumes: 9, goldfish: 6
+Sue 275: cars: 4, trees: 2, perfumes: 7
+Sue 276: akitas: 3, perfumes: 9, cars: 9
+Sue 277: akitas: 8, vizslas: 2, cats: 6
+Sue 278: trees: 5, goldfish: 7, akitas: 3
+Sue 279: perfumes: 9, cars: 8, vizslas: 2
+Sue 280: trees: 3, vizslas: 0, children: 0
+Sue 281: cars: 7, trees: 2, cats: 5
+Sue 282: vizslas: 4, cars: 10, cats: 3
+Sue 283: akitas: 10, cats: 3, samoyeds: 9
+Sue 284: trees: 7, children: 5, goldfish: 6
+Sue 285: cars: 2, perfumes: 5, cats: 7
+Sue 286: samoyeds: 5, trees: 10, goldfish: 6
+Sue 287: goldfish: 10, perfumes: 4, trees: 7
+Sue 288: vizslas: 9, trees: 9, perfumes: 0
+Sue 289: trees: 4, goldfish: 9, vizslas: 8
+Sue 290: vizslas: 3, cars: 3, trees: 2
+Sue 291: goldfish: 2, akitas: 2, trees: 2
+Sue 292: children: 1, cars: 0, vizslas: 5
+Sue 293: trees: 5, akitas: 4, goldfish: 6
+Sue 294: akitas: 3, vizslas: 7, pomeranians: 5
+Sue 295: goldfish: 10, vizslas: 3, trees: 1
+Sue 296: cars: 2, trees: 1, akitas: 0
+Sue 297: akitas: 10, vizslas: 6, samoyeds: 2
+Sue 298: children: 5, trees: 1, samoyeds: 9
+Sue 299: perfumes: 9, trees: 6, vizslas: 1
+Sue 300: akitas: 7, pomeranians: 6, vizslas: 6
+Sue 301: cats: 7, children: 6, vizslas: 7
+Sue 302: trees: 2, vizslas: 7, samoyeds: 4
+Sue 303: goldfish: 0, samoyeds: 10, cars: 4
+Sue 304: pomeranians: 9, children: 3, vizslas: 5
+Sue 305: akitas: 8, vizslas: 4, cars: 5
+Sue 306: akitas: 0, perfumes: 2, pomeranians: 10
+Sue 307: akitas: 9, cars: 0, trees: 2
+Sue 308: vizslas: 10, goldfish: 8, akitas: 6
+Sue 309: trees: 0, cats: 6, perfumes: 2
+Sue 310: vizslas: 10, cars: 1, trees: 4
+Sue 311: goldfish: 8, perfumes: 6, cats: 3
+Sue 312: goldfish: 0, children: 1, akitas: 2
+Sue 313: pomeranians: 10, trees: 6, samoyeds: 6
+Sue 314: vizslas: 5, akitas: 4, pomeranians: 2
+Sue 315: goldfish: 7, trees: 0, akitas: 5
+Sue 316: goldfish: 4, vizslas: 5, cars: 7
+Sue 317: perfumes: 7, cats: 10, cars: 4
+Sue 318: samoyeds: 10, cars: 9, trees: 7
+Sue 319: pomeranians: 8, vizslas: 6, cars: 3
+Sue 320: cars: 4, cats: 9, akitas: 4
+Sue 321: cars: 6, trees: 2, perfumes: 6
+Sue 322: goldfish: 1, cats: 2, perfumes: 4
+Sue 323: akitas: 6, cats: 5, cars: 8
+Sue 324: cats: 4, vizslas: 9, akitas: 0
+Sue 325: children: 8, samoyeds: 9, trees: 4
+Sue 326: vizslas: 2, samoyeds: 10, perfumes: 7
+Sue 327: goldfish: 7, pomeranians: 4, akitas: 10
+Sue 328: perfumes: 8, cats: 4, akitas: 10
+Sue 329: trees: 0, cars: 9, goldfish: 3
+Sue 330: trees: 5, samoyeds: 7, perfumes: 8
+Sue 331: cars: 4, perfumes: 2, goldfish: 0
+Sue 332: vizslas: 4, pomeranians: 7, akitas: 1
+Sue 333: akitas: 4, goldfish: 3, perfumes: 0
+Sue 334: samoyeds: 3, akitas: 10, vizslas: 0
+Sue 335: goldfish: 1, akitas: 7, vizslas: 6
+Sue 336: perfumes: 1, goldfish: 1, pomeranians: 8
+Sue 337: children: 5, cars: 4, cats: 4
+Sue 338: vizslas: 5, cars: 10, cats: 3
+Sue 339: trees: 2, goldfish: 3, cars: 1
+Sue 340: trees: 10, goldfish: 6, perfumes: 2
+Sue 341: akitas: 5, trees: 6, cats: 3
+Sue 342: cars: 10, children: 8, goldfish: 0
+Sue 343: cats: 2, akitas: 0, pomeranians: 4
+Sue 344: perfumes: 1, vizslas: 3, cars: 3
+Sue 345: samoyeds: 8, cats: 5, perfumes: 8
+Sue 346: cars: 5, akitas: 10, trees: 2
+Sue 347: vizslas: 9, akitas: 9, cars: 3
+Sue 348: cars: 3, perfumes: 1, pomeranians: 9
+Sue 349: akitas: 1, cars: 4, perfumes: 0
+Sue 350: perfumes: 8, vizslas: 2, trees: 6
+Sue 351: pomeranians: 5, akitas: 9, cats: 8
+Sue 352: pomeranians: 8, vizslas: 3, goldfish: 10
+Sue 353: trees: 2, pomeranians: 0, goldfish: 6
+Sue 354: cats: 5, akitas: 7, goldfish: 6
+Sue 355: goldfish: 6, children: 4, trees: 10
+Sue 356: children: 1, trees: 3, akitas: 7
+Sue 357: trees: 2, samoyeds: 10, goldfish: 3
+Sue 358: samoyeds: 10, cats: 0, goldfish: 0
+Sue 359: perfumes: 3, children: 6, pomeranians: 1
+Sue 360: cars: 10, pomeranians: 1, samoyeds: 5
+Sue 361: samoyeds: 9, pomeranians: 7, perfumes: 6
+Sue 362: goldfish: 6, trees: 8, perfumes: 9
+Sue 363: samoyeds: 10, pomeranians: 9, children: 10
+Sue 364: perfumes: 3, goldfish: 7, cars: 9
+Sue 365: cats: 3, children: 4, samoyeds: 8
+Sue 366: trees: 0, cars: 10, vizslas: 10
+Sue 367: pomeranians: 10, children: 8, perfumes: 2
+Sue 368: cars: 5, vizslas: 0, samoyeds: 3
+Sue 369: trees: 1, goldfish: 8, cars: 8
+Sue 370: vizslas: 0, cars: 2, perfumes: 5
+Sue 371: trees: 2, cars: 3, vizslas: 8
+Sue 372: trees: 10, children: 9, cats: 1
+Sue 373: pomeranians: 3, perfumes: 1, vizslas: 0
+Sue 374: vizslas: 0, perfumes: 6, trees: 0
+Sue 375: vizslas: 7, pomeranians: 1, akitas: 10
+Sue 376: vizslas: 8, trees: 2, cars: 10
+Sue 377: perfumes: 9, cats: 5, goldfish: 5
+Sue 378: cats: 0, akitas: 10, perfumes: 9
+Sue 379: cars: 4, akitas: 1, trees: 1
+Sue 380: cars: 4, perfumes: 5, trees: 3
+Sue 381: goldfish: 3, akitas: 5, samoyeds: 9
+Sue 382: goldfish: 7, perfumes: 5, trees: 5
+Sue 383: akitas: 4, cats: 6, cars: 8
+Sue 384: children: 6, goldfish: 10, akitas: 7
+Sue 385: akitas: 7, vizslas: 5, perfumes: 10
+Sue 386: children: 7, vizslas: 10, akitas: 10
+Sue 387: goldfish: 6, akitas: 7, trees: 2
+Sue 388: vizslas: 6, trees: 1, akitas: 2
+Sue 389: cars: 5, vizslas: 3, akitas: 7
+Sue 390: vizslas: 4, cats: 8, perfumes: 7
+Sue 391: akitas: 3, trees: 0, children: 2
+Sue 392: cats: 7, cars: 3, children: 9
+Sue 393: trees: 10, vizslas: 3, goldfish: 7
+Sue 394: perfumes: 0, goldfish: 7, akitas: 4
+Sue 395: cats: 6, cars: 7, vizslas: 0
+Sue 396: vizslas: 4, perfumes: 6, goldfish: 5
+Sue 397: pomeranians: 8, trees: 1, akitas: 9
+Sue 398: goldfish: 7, pomeranians: 6, samoyeds: 9
+Sue 399: perfumes: 10, cars: 1, trees: 8
+Sue 400: trees: 0, goldfish: 9, children: 6
+Sue 401: trees: 1, cars: 6, pomeranians: 8
+Sue 402: perfumes: 9, cars: 0, vizslas: 10
+Sue 403: samoyeds: 4, akitas: 1, vizslas: 9
+Sue 404: perfumes: 0, trees: 2, cars: 4
+Sue 405: akitas: 0, perfumes: 5, samoyeds: 4
+Sue 406: akitas: 8, vizslas: 6, children: 2
+Sue 407: children: 1, trees: 8, goldfish: 10
+Sue 408: pomeranians: 4, trees: 10, cars: 9
+Sue 409: perfumes: 5, vizslas: 5, akitas: 4
+Sue 410: trees: 1, akitas: 10, vizslas: 6
+Sue 411: samoyeds: 0, goldfish: 9, perfumes: 7
+Sue 412: goldfish: 7, samoyeds: 10, trees: 1
+Sue 413: samoyeds: 0, pomeranians: 10, vizslas: 6
+Sue 414: children: 2, cars: 10, samoyeds: 2
+Sue 415: trees: 2, goldfish: 8, cars: 0
+Sue 416: samoyeds: 4, goldfish: 9, trees: 2
+Sue 417: trees: 8, akitas: 10, perfumes: 3
+Sue 418: samoyeds: 9, goldfish: 2, cars: 1
+Sue 419: akitas: 2, perfumes: 8, trees: 2
+Sue 420: children: 3, goldfish: 6, perfumes: 5
+Sue 421: akitas: 8, perfumes: 2, samoyeds: 6
+Sue 422: vizslas: 10, akitas: 4, pomeranians: 3
+Sue 423: cats: 8, perfumes: 3, trees: 4
+Sue 424: cars: 2, children: 4, pomeranians: 8
+Sue 425: pomeranians: 4, samoyeds: 2, goldfish: 4
+Sue 426: perfumes: 6, cars: 4, goldfish: 4
+Sue 427: akitas: 0, goldfish: 7, perfumes: 5
+Sue 428: perfumes: 4, cars: 3, akitas: 5
+Sue 429: trees: 0, vizslas: 0, goldfish: 1
+Sue 430: perfumes: 4, vizslas: 2, cars: 7
+Sue 431: goldfish: 7, pomeranians: 8, trees: 0
+Sue 432: goldfish: 7, children: 9, trees: 3
+Sue 433: akitas: 1, vizslas: 10, trees: 2
+Sue 434: perfumes: 2, cars: 4, goldfish: 10
+Sue 435: pomeranians: 6, vizslas: 9, trees: 1
+Sue 436: cars: 9, trees: 0, goldfish: 0
+Sue 437: trees: 1, goldfish: 1, vizslas: 8
+Sue 438: goldfish: 7, samoyeds: 8, children: 2
+Sue 439: children: 1, cats: 7, vizslas: 8
+Sue 440: cats: 2, pomeranians: 6, goldfish: 4
+Sue 441: perfumes: 7, cats: 3, vizslas: 6
+Sue 442: akitas: 4, samoyeds: 5, cars: 2
+Sue 443: akitas: 3, perfumes: 3, cats: 9
+Sue 444: perfumes: 10, akitas: 6, trees: 0
+Sue 445: cars: 5, children: 9, perfumes: 8
+Sue 446: vizslas: 10, cars: 3, perfumes: 5
+Sue 447: children: 9, perfumes: 1, cars: 10
+Sue 448: akitas: 0, goldfish: 8, trees: 3
+Sue 449: cars: 7, akitas: 8, children: 3
+Sue 450: cars: 4, akitas: 9, cats: 0
+Sue 451: perfumes: 4, samoyeds: 5, goldfish: 6
+Sue 452: perfumes: 10, akitas: 1, cars: 7
+Sue 453: trees: 1, goldfish: 3, vizslas: 6
+Sue 454: goldfish: 8, pomeranians: 6, trees: 10
+Sue 455: akitas: 5, vizslas: 8, goldfish: 10
+Sue 456: cats: 5, trees: 4, samoyeds: 0
+Sue 457: perfumes: 8, cars: 0, cats: 3
+Sue 458: akitas: 1, trees: 10, vizslas: 2
+Sue 459: vizslas: 6, akitas: 3, children: 10
+Sue 460: perfumes: 7, trees: 9, goldfish: 8
+Sue 461: children: 6, vizslas: 4, perfumes: 5
+Sue 462: vizslas: 6, akitas: 8, perfumes: 9
+Sue 463: goldfish: 8, cars: 4, trees: 10
+Sue 464: pomeranians: 8, cars: 5, vizslas: 0
+Sue 465: cats: 10, goldfish: 7, akitas: 1
+Sue 466: cats: 2, children: 1, cars: 6
+Sue 467: perfumes: 3, samoyeds: 6, cars: 0
+Sue 468: samoyeds: 10, pomeranians: 6, trees: 2
+Sue 469: children: 2, perfumes: 2, pomeranians: 4
+Sue 470: cats: 1, perfumes: 5, vizslas: 9
+Sue 471: vizslas: 5, perfumes: 2, akitas: 7
+Sue 472: samoyeds: 8, goldfish: 6, cats: 1
+Sue 473: goldfish: 10, perfumes: 9, cars: 4
+Sue 474: samoyeds: 0, cars: 4, vizslas: 4
+Sue 475: trees: 2, cars: 7, akitas: 8
+Sue 476: vizslas: 3, perfumes: 5, goldfish: 1
+Sue 477: cats: 7, cars: 4, trees: 1
+Sue 478: vizslas: 8, akitas: 3, goldfish: 0
+Sue 479: cars: 6, cats: 3, perfumes: 2
+Sue 480: goldfish: 1, children: 9, vizslas: 3
+Sue 481: pomeranians: 5, vizslas: 1, cars: 10
+Sue 482: children: 5, perfumes: 5, cats: 1
+Sue 483: perfumes: 2, goldfish: 7, trees: 6
+Sue 484: akitas: 2, goldfish: 4, perfumes: 10
+Sue 485: samoyeds: 3, goldfish: 0, akitas: 1
+Sue 486: trees: 8, vizslas: 9, goldfish: 0
+Sue 487: goldfish: 8, samoyeds: 0, trees: 0
+Sue 488: perfumes: 7, cars: 5, trees: 0
+Sue 489: vizslas: 3, pomeranians: 2, perfumes: 5
+Sue 490: cars: 5, perfumes: 5, akitas: 5
+Sue 491: children: 8, trees: 1, pomeranians: 4
+Sue 492: pomeranians: 0, akitas: 1, vizslas: 8
+Sue 493: akitas: 10, perfumes: 10, samoyeds: 8
+Sue 494: perfumes: 6, vizslas: 4, cats: 6
+Sue 495: children: 6, pomeranians: 5, samoyeds: 4
+Sue 496: vizslas: 1, trees: 5, akitas: 1
+Sue 497: vizslas: 10, perfumes: 10, pomeranians: 3
+Sue 498: samoyeds: 3, trees: 2, cars: 5
+Sue 499: cats: 6, children: 3, perfumes: 0
+Sue 500: pomeranians: 10, cats: 3, vizslas: 5
diff --git a/2015/16/puzzle-1.sh b/2015/16/puzzle-1.sh
new file mode 100755
index 0000000..3550231
--- /dev/null
+++ b/2015/16/puzzle-1.sh
@@ -0,0 +1,25 @@
+#!/usr/bin/env sh
+
+# Definitely there is a better way to do this, but this is fine
+# Original solution was just me using regex in vim lol
+
+sed '/children/!s/$/, children: 3/' input \
+	| sed '/cats/!s/$/, cats: 7/' \
+	| sed '/samoyeds/!s/$/, samoyeds: 2/' \
+	| sed '/pomeranians/!s/$/, pomeranians: 3/' \
+	| sed '/akitas/!s/$/, akitas: 0/' \
+	| sed '/vizslas/!s/$/, vizslas: 0/' \
+	| sed '/goldfish/!s/$/, goldfish: 5/' \
+	| sed '/trees/!s/$/, trees: 3/' \
+	| sed '/cars/!s/$/, cars: 2/' \
+	| sed '/perfumes/!s/$/, perfumes: 1/' \
+	| grep 'children: 3' \
+	| grep 'cats: 7' \
+	| grep 'samoyeds: 2' \
+	| grep 'pomeranians: 3' \
+	| grep 'akitas: 0' \
+	| grep 'vizslas: 0' \
+	| grep 'goldfish: 5' \
+	| grep 'trees: 3' \
+	| grep 'cars: 2' \
+	| sed -n '/perfumes: 1/s/Sue \([0-9]*\).*/\1/p'
diff --git a/2015/16/puzzle-2.sh b/2015/16/puzzle-2.sh
new file mode 100755
index 0000000..e854c7c
--- /dev/null
+++ b/2015/16/puzzle-2.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env sh
+
+# Definitely there is a better way to do this, but this is fine
+# Original solution was just me using regex in vim lol
+
+sed '/children/!s/$/, children: 3/' input \
+	| sed '/cats/!s/$/, cats: 8/' \
+	| sed '/samoyeds/!s/$/, samoyeds: 2/' \
+	| sed '/pomeranians/!s/$/, pomeranians: 2/' \
+	| sed '/akitas/!s/$/, akitas: 0/' \
+	| sed '/vizslas/!s/$/, vizslas: 0/' \
+	| sed '/goldfish/!s/$/, goldfish: 4/' \
+	| sed '/trees/!s/$/, trees: 4/' \
+	| sed '/cars/!s/$/, cars: 2/' \
+	| sed '/perfumes/!s/$/, perfumes: 1/' \
+	| sed 's/$/ /' \
+	| grep 'children: 3' \
+	| grep 'samoyeds: 2' \
+	| grep 'akitas: 0' \
+	| grep 'vizslas: 0' \
+	| grep 'cars: 2' \
+	| grep 'perfumes: 1' \
+	| grep 'goldfish: [0-4][ ,]' \
+	| grep 'pomeranians: [0-2][ ,]' \
+	| grep 'cats: \([8-9]\|[1-9][0-9]\)' \
+	| sed -n '/trees: \([4-9]\|[1-9][0-9]\)/s/Sue \([0-9]*\).*/\1/p'
diff --git a/2015/17/input b/2015/17/input
new file mode 100644
index 0000000..09ebd46
--- /dev/null
+++ b/2015/17/input
@@ -0,0 +1,20 @@
+43
+3
+4
+10
+21
+44
+4
+6
+47
+41
+34
+17
+17
+44
+36
+31
+46
+9
+27
+38
diff --git a/2015/17/puzzle-1.py b/2015/17/puzzle-1.py
new file mode 100755
index 0000000..b201e5b
--- /dev/null
+++ b/2015/17/puzzle-1.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python3
+
+import itertools
+
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		nums = list(map(int, f.readlines()))
+
+	combs: list[tuple[int, ...]] = []
+	for n in range(len(nums) + 1):
+		combs += list(itertools.combinations(nums, n))
+
+	print(len(list(filter(lambda x: sum(x) == 150, combs))))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2015/17/puzzle-2.py b/2015/17/puzzle-2.py
new file mode 100755
index 0000000..43f8922
--- /dev/null
+++ b/2015/17/puzzle-2.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+import itertools
+
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		nums = list(map(int, f.readlines()))
+
+	combs: list[tuple[int, ...]] = []
+	for n in range(len(nums) + 1):
+		combs += list(itertools.combinations(nums, n))
+
+	combs = list(filter(lambda x: sum(x) == 150, combs))
+	conts = min(map(len, combs))
+	print(len(list(filter(lambda x: len(x) == conts, combs))))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2015/18/input b/2015/18/input
new file mode 100644
index 0000000..5efaa1b
--- /dev/null
+++ b/2015/18/input
@@ -0,0 +1,100 @@
+#...##......#......##.##..#...##......##.#.#.###.#.#..#..#......####..#......###.#.#....#..##..###..
+####..#.#...#....#.#####.##.##.#..#.......#....#.##...###.###..#.#.#........#..#.#.##...##..#.####.#
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diff --git a/2015/18/puzzle-1.py b/2015/18/puzzle-1.py
new file mode 100755
index 0000000..ef6d36e
--- /dev/null
+++ b/2015/18/puzzle-1.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+
+def neighbours(data: list[list[str]], x: int, y: int) -> int:
+	acc = 0
+
+	for x1, y1 in [
+		(x - 1, y - 1),
+		(x - 1, y),
+		(x - 1, y + 1),
+		(x, y - 1),
+		(x, y + 1),
+		(x + 1, y - 1),
+		(x + 1, y),
+		(x + 1, y + 1),
+	]:
+		try:
+			if x1 >= 0 and y1 >= 0 and data[x1][y1] == "#":
+				acc += 1
+		except IndexError:
+			pass
+
+	return acc
+
+
+def simulate(data: list[list[str]]) -> list[list[str]]:
+	ndata = [["." for i in range(100)] for j in range(100)]
+
+	for i in range(100):
+		for j in range(100):
+			if data[i][j] == "#" and neighbours(data, i, j) in [2, 3]:
+				ndata[i][j] = "#"
+			elif data[i][j] == "." and neighbours(data, i, j) == 3:
+				ndata[i][j] = "#"
+
+	return ndata
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		data = [list(l.strip()) for l in f.readlines()]
+
+	for i in range(100):
+		data = simulate(data)
+
+	print(sum(data[i].count("#") for i in range(100)))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2015/18/puzzle-2.py b/2015/18/puzzle-2.py
new file mode 100755
index 0000000..9a998b8
--- /dev/null
+++ b/2015/18/puzzle-2.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+
+def neighbours(data: list[list[str]], x: int, y: int) -> int:
+	acc = 0
+
+	for x1, y1 in [
+		(x - 1, y - 1),
+		(x - 1, y),
+		(x - 1, y + 1),
+		(x, y - 1),
+		(x, y + 1),
+		(x + 1, y - 1),
+		(x + 1, y),
+		(x + 1, y + 1),
+	]:
+		try:
+			if x1 >= 0 and y1 >= 0 and data[x1][y1] == "#":
+				acc += 1
+		except IndexError:
+			pass
+
+	return acc
+
+
+def simulate(data: list[list[str]]) -> list[list[str]]:
+	ndata = [["." for i in range(100)] for j in range(100)]
+
+	for i in range(100):
+		for j in range(100):
+			if (i, j) in [(0, 0), (0, 99), (99, 0), (99, 99)]:
+				ndata[i][j] = "#"
+			elif data[i][j] == "#" and neighbours(data, i, j) in [2, 3]:
+				ndata[i][j] = "#"
+			elif data[i][j] == "." and neighbours(data, i, j) == 3:
+				ndata[i][j] = "#"
+
+	return ndata
+
+def main() -> None:
+	with open("input", "r", encoding="utf-8") as f:
+		data = [list(l.strip()) for l in f.readlines()]
+	data[0][0], data[0][99], data[99][0], data[99][99] = "#", "#", "#", "#"
+
+	for i in range(100):
+		data = simulate(data)
+
+	print(sum(data[i].count("#") for i in range(100)))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/01/.gitignore b/2020/01/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/01/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/01/Makefile b/2020/01/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/01/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/01/input b/2020/01/input
new file mode 100644
index 0000000..127b7a7
--- /dev/null
+++ b/2020/01/input
@@ -0,0 +1,200 @@
+1293
+1207
+1623
+1675
+1842
+1410
+85
+1108
+557
+1217
+1506
+1956
+1579
+1614
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+1972
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+1396
diff --git a/2020/01/puzzles.c b/2020/01/puzzles.c
new file mode 100644
index 0000000..29384e0
--- /dev/null
+++ b/2020/01/puzzles.c
@@ -0,0 +1,39 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUFFER 200
+
+int
+main(void)
+{
+	int nums[BUFFER];
+	FILE *fp;
+
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	for (int i = 0; i < BUFFER; i++)
+		fscanf(fp, "%d", &nums[i]);
+
+	fclose(fp);
+
+	/* Inefficient, but small sample size so it's fine */
+	for (int i = 0; i < BUFFER - 1; i++) {
+		for (int j = i + 1; j < BUFFER; j++) {
+#ifdef PART2
+			for (int k = j + 1; k < BUFFER; k++) {
+				if (nums[i] + nums[j] + nums[k] == 2020) {
+					printf("%d\n", nums[i] * nums[j] * nums[k]);
+					return EXIT_SUCCESS;
+				}
+			}
+#else
+			if (nums[i] + nums[j] == 2020) {
+				printf("%d\n", nums[i] * nums[j]);
+				return EXIT_SUCCESS;
+			}
+#endif
+		}
+	}
+}
diff --git a/2020/02/input b/2020/02/input
new file mode 100644
index 0000000..45e8c19
--- /dev/null
+++ b/2020/02/input
@@ -0,0 +1,1000 @@
+5-6 s: zssmssbsms
+3-6 j: jjjjjrrj
+4-7 k: kfkgkkkkk
+2-3 n: nkbgfnn
+7-12 h: hhhhhhdhhhhhfhhhh
+1-4 v: nvvv
+6-9 h: hhthplhgmpzsmhhxhh
+6-7 r: rrtrrrgrgcc
+10-15 h: sdbhvbhfjhwllmrpdv
+3-4 s: bsss
+5-7 s: sstjsswsspldr
+10-14 b: bzbqbbbkpvbblbnrbs
+4-11 s: sssmcskwsssssss
+2-10 v: rlttvvnvvvvvvksm
+4-5 x: xkrxx
+2-5 m: bfmmmmm
+11-14 r: rlprrtrcrxcrgrrhrr
+4-16 l: dzllmllldnllblwcr
+3-4 t: nplr
+3-5 x: jcxxgkxtjwwgh
+3-4 j: msjcjqjgxmjsjfjjj
+1-6 z: zgkkdzww
+3-5 q: pgqqbq
+17-19 t: tttkttwtttttttttttt
+5-11 n: nqnlfknntdn
+11-12 c: ccccccccccgc
+2-14 x: pxmvfrrwlbzxhk
+4-5 g: gcggwggxv
+4-5 h: phbzhhhqhl
+4-5 h: hwbhk
+1-2 t: tgmq
+16-19 l: llllbjlfvnlhwlllqfp
+4-6 r: srrrqggrs
+1-3 g: nggwhvcl
+1-8 f: pffffffff
+2-3 l: lllll
+13-15 d: ddrdkdddmdmdddd
+11-13 r: rrrgrkrrdrwrrr
+3-10 x: xxxxxxxtxq
+6-7 p: pspzpvlpxnplhtpc
+3-8 f: fsfkfbffvxfc
+3-5 z: zzzvwzsfktz
+4-7 c: cccgccc
+11-12 n: nnnnnnnnnnzn
+12-13 n: nnnnnnnmznnpnnn
+4-7 q: wqqzgqgfg
+5-13 p: tgplpbpmvgpppktps
+12-13 x: zwcxlnhwpsvxm
+7-10 r: rrrrrrnrrrrgr
+1-5 r: rlrrj
+15-18 l: nlllllslcllllllllcl
+10-11 w: wnwwzwwwwwwwmwrwr
+10-11 j: njmmjjjcjjv
+3-6 z: vgbdvzgzzzzw
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+4-5 c: rgvcgmccc
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+2-6 z: zkzzzzzhzzzz
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diff --git a/2020/02/puzzle-1.awk b/2020/02/puzzle-1.awk
new file mode 100755
index 0000000..77971dc
--- /dev/null
+++ b/2020/02/puzzle-1.awk
@@ -0,0 +1,10 @@
+#!/usr/bin/env -S awk -f
+
+{
+	split($1, bounds, "-")
+	freq = gsub(substr($2, 1, 1), "&") - 1
+	if (freq >= bounds[1] && freq <= bounds[2])
+		count++
+}
+
+END { print count }
diff --git a/2020/02/puzzle-2.awk b/2020/02/puzzle-2.awk
new file mode 100755
index 0000000..24398e7
--- /dev/null
+++ b/2020/02/puzzle-2.awk
@@ -0,0 +1,19 @@
+#!/usr/bin/env -S awk -f
+
+{
+	split($1, pos, "-")
+	split($3, str, "")
+	char = substr($2, 1, 1)
+
+	# Count the frequency of char
+	freq = 0
+	if (str[pos[1]] == char)
+		freq++
+	if (str[pos[2]] == char)
+		freq++
+
+	if (freq == 1)
+		count++
+}
+
+END { print count }
diff --git a/2020/03/input b/2020/03/input
new file mode 100644
index 0000000..6673c40
--- /dev/null
+++ b/2020/03/input
@@ -0,0 +1,323 @@
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diff --git a/2020/03/puzzle-1.awk b/2020/03/puzzle-1.awk
new file mode 100755
index 0000000..3eac2ba
--- /dev/null
+++ b/2020/03/puzzle-1.awk
@@ -0,0 +1,14 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN { x = 1 }
+{
+	len = split($0, obs, "")
+
+	if (x > len)
+		x -= len
+	if (obs[x] == "#")
+		count++
+
+	x += 3
+}
+END  { print count }
diff --git a/2020/03/puzzle-2.awk b/2020/03/puzzle-2.awk
new file mode 100755
index 0000000..88e0625
--- /dev/null
+++ b/2020/03/puzzle-2.awk
@@ -0,0 +1,36 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN {
+	slope[1] = 1
+	slope[2] = 1
+	slope[3] = 1
+	slope[4] = 1
+	slope[5] = 1
+}
+
+{
+	len = split($0, obs, "")
+
+	right = 1
+	for (i = 1; i < 5; i++) {
+		if (slope[i] > len)
+			slope[i] -= len
+
+		if (obs[slope[i]] == "#")
+			count[i]++
+
+		slope[i] += right
+		right += 2
+	}
+
+	# Specific code for slope 5
+	if (NR % 2 == 1) {
+		if (slope[5] > len)
+			slope[5] -= len
+
+		if (obs[slope[5]++] == "#")
+			count[5]++
+	}
+}
+
+END { print count[1] * count[2] * count[3] * count[4] * count[5] }
diff --git a/2020/04/input b/2020/04/input
new file mode 100644
index 0000000..c49fb69
--- /dev/null
+++ b/2020/04/input
@@ -0,0 +1,1135 @@
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+hgt:160cm
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+hcl:#866857
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+pid:344179526
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+byr:1925 eyr:2021
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+
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+
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+
+pid:283188332 hgt:168cm hcl:#6b5442
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+
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+hcl:#866857
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+hgt:168cm
+
+cid:317 pid:333228098 hgt:158cm iyr:2014 byr:1958 eyr:2024 hcl:#a97842 ecl:oth
+
+hcl:#733820
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+pid:790938694 iyr:2014
+
+iyr:2020 ecl:grt eyr:2018
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+
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+
+byr:1998
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+ecl:brn eyr:2021 pid:567032567 hcl:#733820 cid:328 iyr:2017
+
+pid:491430863 cid:146 hgt:181cm eyr:2026 iyr:2015 ecl:amb byr:1950 hcl:#c0946f
+
+eyr:2033 cid:289
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+
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+pid:403990108 eyr:2030
+
+pid:42635067 cid:301
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+
+byr:2020 hcl:#fffffd
+hgt:180in eyr:2040 pid:304951921
+iyr:2030 ecl:#1aaf20
+
+iyr:2020 hcl:#888785 ecl:hzl hgt:181cm byr:1992 eyr:2021 pid:936006959
+
+hgt:172in ecl:#fd71a7
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+iyr:2022
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+
+iyr:2018 ecl:blu eyr:2029 hcl:#cfa07d hgt:155cm byr:1937 pid:851148031
+
+byr:2014
+cid:222 ecl:zzz hgt:67cm eyr:2040 pid:#8ab0e2 hcl:z iyr:2027
+
+hgt:180cm hcl:#375883 eyr:2027 byr:1925 ecl:brn
+iyr:2011
+pid:158752719
+
+byr:1935 ecl:oth eyr:2027 pid:041108579
+hcl:#602927 iyr:2011 hgt:190cm
+
+hcl:#a97842 pid:131728607 ecl:blu iyr:2014 hgt:176cm eyr:2020
+byr:1921
+
+pid:11754457
+iyr:2018
+hgt:65cm eyr:2038
+ecl:dne hcl:z
+cid:293
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+
+eyr:2023
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+hcl:#733820 hgt:59in
+pid:319501919
+
+cid:278
+eyr:1967 hcl:#ceb3a1 pid:#9f5254 hgt:177in byr:1977 iyr:2030
+
+hcl:#ceb3a1 byr:1998 hgt:72in cid:202 ecl:gry pid:463378493 iyr:2015
+eyr:2030
+
+hcl:#7d3b0c hgt:164cm ecl:hzl byr:1960 eyr:2023
+iyr:2017
+
+ecl:hzl hcl:#866857 byr:1986 iyr:2018 eyr:2027 hgt:176cm pid:928057092
+
+pid:431113230 hgt:186cm eyr:2025
+iyr:2018 ecl:amb byr:1973 hcl:#623a2f
+
+hcl:#cfa07d hgt:179cm iyr:2017 pid:760075190 ecl:amb eyr:2030
+
+hcl:#602927
+iyr:2012
+pid:571020910 ecl:#b6715d byr:1943 eyr:2028
+hgt:161cm
+
+hgt:176cm cid:121 pid:654127593 ecl:brn hcl:#160d38 iyr:2015
+eyr:2021 byr:1997
+
+eyr:2021 byr:1929
+pid:192025713
+hcl:#c0946f iyr:2012 ecl:oth hgt:179cm
+
+eyr:2024 ecl:gry
+hgt:158cm byr:1932 hcl:#ceb3a1
+iyr:2010
+pid:521188306
+
+eyr:2028 ecl:brn
+hcl:#efcc98
+hgt:157cm
+iyr:2012
+pid:212547203 byr:1970
+
+eyr:2029 pid:182693366 hcl:#623a2f hgt:130 byr:1972
+cid:310
+iyr:2010 ecl:amb
+
+byr:1944 iyr:2013
+ecl:brn cid:335
+hgt:163cm
+eyr:2025 hcl:#7d3b0c pid:405230824
+
+hcl:#ceb3a1 iyr:2015 pid:572001387 byr:1962
+ecl:amb hgt:151cm
+
+byr:1928
+eyr:2022
+iyr:2018 ecl:blu
+hcl:#602927 pid:767081131
+
+byr:1948 hgt:180in pid:188cm
+ecl:hzl
+eyr:2013 hcl:e0b9f3 iyr:1975
+
+hcl:#c0946f byr:1989
+eyr:1980 hgt:67cm pid:538025041
+iyr:2014 ecl:gry
+
+eyr:2028 pid:958756919 hcl:#733820 byr:1945 cid:158 ecl:blu
+hgt:168cm iyr:2018
+
+cid:200 hcl:#fffffd
+byr:2015 ecl:gry eyr:2031 hgt:59 pid:065027646
+iyr:1967
+
+byr:1999 ecl:hzl pid:813536928 iyr:2015 cid:296 hcl:#6b5442
+eyr:2025 hgt:186cm
+
+byr:2000 iyr:2012
+hcl:#fffffd
+cid:263 hgt:68in pid:105489529
+ecl:amb eyr:2024
+
+eyr:2026 hcl:#602927 hgt:181cm
+byr:1982
+pid:603871531 iyr:2018 ecl:blu
+
+cid:302 pid:387895477 eyr:2027
+hcl:#cfa07d hgt:191cm iyr:2015
+ecl:hzl byr:1940
+
+iyr:2018 cid:165
+ecl:blu hgt:181cm byr:1994 eyr:2026 pid:077013268
+
+eyr:2022 hgt:174in iyr:2010 byr:2023
+hcl:#733820 ecl:oth
+pid:311692961
+
+ecl:#10f2a9 pid:964417986
+eyr:2024 hcl:#0aeec7 byr:1965 iyr:1943 hgt:167cm
+
+hcl:#341e13 iyr:2020
+ecl:brn
+hgt:188cm eyr:2021 byr:1952
+pid:077471062
+
+byr:1950 cid:110 hgt:160cm eyr:2026
+hcl:#623a2f
+iyr:2013
+pid:972823574
+
+pid:553704996 hgt:171cm
+eyr:2028 iyr:2017
+hcl:#18171d byr:1954 ecl:blu
+
+hgt:180cm ecl:brn eyr:2029 pid:707999496 hcl:#cfa07d byr:1960
+
+pid:9325738036 iyr:1996 hgt:152in byr:2004 cid:292 hcl:14a56f
+eyr:2031
+ecl:#dbd99d
+
+byr:1957
+eyr:2021 pid:557648216 ecl:amb hcl:#7d3b0c hgt:186cm
+iyr:2020
+
+hcl:#602927 hgt:186cm pid:604175608
+iyr:2013 eyr:2026 ecl:oth byr:1991 cid:65
+
+ecl:gry
+iyr:2012 hgt:154cm
+pid:872898058 eyr:2030 hcl:#341e13 byr:1994
+
+pid:228236326
+iyr:2013 cid:347 byr:1942
+eyr:2021 ecl:brn
+hgt:165cm
+hcl:#fffffd
+
+pid:392777182 cid:189 hcl:#cfa07d eyr:2027 hgt:191cm ecl:blu byr:1978
+
+hgt:158in iyr:2028
+pid:5145408095 byr:2012 ecl:#94c57d hcl:z eyr:1996
+
+byr:1949 eyr:2021
+ecl:#5ffbeb iyr:1948 pid:42650064 hcl:z hgt:167cm
+
+iyr:2013 ecl:xry cid:100
+hgt:138 byr:2013
+eyr:1944 hcl:92b68c
+
+hgt:187cm
+ecl:grn hcl:#602927
+iyr:2010
+eyr:2022 byr:1949 cid:280 pid:251802347
+
+ecl:grn
+cid:219
+iyr:2018 hgt:165cm
+pid:703878503 eyr:2024 hcl:#b6652a
+byr:2002
+
+hcl:#18171d cid:341 ecl:amb byr:1941 eyr:2021 iyr:1990 pid:865132177 hgt:153cm
+
+byr:2008 pid:861480549
+cid:97 eyr:2028 hcl:#efcc98
+iyr:2015
+hgt:191cm ecl:#232b23
+
+hcl:#cfa07d
+eyr:2030 iyr:2013 cid:304
+ecl:gry pid:199056608 hgt:192cm
+byr:1926
+
+pid:355135528 hgt:153cm byr:1998 iyr:2019 eyr:2027
+ecl:amb hcl:#18171d
+
+eyr:2028 hcl:8eed9c ecl:grn
+iyr:2010 byr:2005 hgt:107
+pid:64892698
+
+pid:601671623 hgt:153cm iyr:2011 hcl:#b6652a byr:1975 ecl:grn eyr:2029
+
+ecl:grn hcl:#18171d hgt:157cm
+eyr:2023 pid:507932715 byr:1920 iyr:2020
+
+eyr:2022 byr:1933 hcl:#fffffd iyr:2016 hgt:181cm pid:826522507 ecl:blu
+
+byr:2002 hcl:#866857 hgt:177cm pid:240202426
+ecl:gry cid:127
+eyr:2022
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+
+byr:1971
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+pid:733985576 hcl:#c58c6c hgt:178cm
+ecl:blu
+eyr:2023
+
+ecl:blu iyr:2017 pid:558732458 hcl:#1b3ab5 eyr:2025 byr:1967 hgt:176cm
+
+eyr:2025 ecl:gry iyr:2020 byr:1988
+hcl:#733820
+hgt:189cm cid:151 pid:934827751
+
+ecl:gry eyr:1951
+iyr:1932
+pid:309366394 byr:1945 hcl:#623a2f hgt:179cm
+
+pid:462345884 ecl:hzl
+cid:206 eyr:2021 hcl:#733820
+byr:1982 hgt:180cm iyr:2010
+
+iyr:2020 hgt:155cm hcl:#341e13 pid:110467532 cid:92 ecl:hzl byr:1975 eyr:2028
+
+hcl:#18171d iyr:2010
+hgt:182cm byr:1930
+eyr:2024
+cid:226
+
+byr:1956 hcl:fb0c6f pid:181cm eyr:2012 iyr:2020
+ecl:#d38822
+hgt:69cm
+
+ecl:gry iyr:2018
+hgt:169cm byr:1981
+pid:534824014 cid:287 eyr:2021 hcl:#c0946f
+
+eyr:2039 hcl:#328e90 iyr:2015
+hgt:170cm pid:#9fa2a4 byr:1999
+ecl:#cd1fd7
+
+hgt:190cm hcl:#733820
+pid:302244363
+ecl:brn
+byr:1965 iyr:2013
+
+iyr:2012
+eyr:2021
+pid:579705743
+ecl:brn hgt:190in
+byr:1954 hcl:#888785
+
+eyr:2036 hgt:154cm
+pid:800720865 byr:2023 ecl:oth iyr:2010 hcl:z
+
+pid:#92f6a9 iyr:2028 eyr:1943
+hgt:191cm ecl:hzl hcl:z byr:2018
+
+hcl:#c0946f
+pid:419930442 hgt:167cm
+byr:1969
+eyr:2020 ecl:brn
+
+pid:137802946
+eyr:2020 byr:1947 ecl:grn hgt:192cm iyr:2016 hcl:#888785
+
+ecl:#f66cce eyr:1958 iyr:1954
+pid:833131572
+hcl:z
+cid:212
+hgt:109 byr:1924
+
+hgt:179cm ecl:gry pid:065881341 byr:1985
+hcl:#fffffd cid:204 eyr:2026
+
+hgt:167cm
+iyr:2017 pid:898571403 byr:1929
+ecl:blu hcl:#d506d0 eyr:2028 cid:100
+
+byr:1991 pid:2795214253 iyr:2011
+cid:152 eyr:2028
+hgt:170cm hcl:#a45065 ecl:lzr
+
+hgt:188cm eyr:2030 iyr:2010
+pid:297292695 byr:1955 hcl:#fffffd
+ecl:blu
+
+hgt:170cm eyr:2029 pid:913242036 byr:1993 cid:89 hcl:#888785
+iyr:2010
+ecl:blu
+
+iyr:2028 eyr:2025 hgt:150in ecl:grn
+byr:1995
+pid:974802728
+hcl:#cfa07d
+
+eyr:2021 byr:1989
+hcl:#18171d ecl:blu hgt:168cm
+pid:626530259
+iyr:2020
+
+hcl:#6b5442 hgt:158cm pid:798732187 byr:1922 eyr:2020 iyr:2011 ecl:gry
+
+hcl:#341e13 pid:092679330 byr:1997 ecl:oth hgt:159cm iyr:2010 eyr:2026
+
+hgt:185cm
+iyr:2020 byr:1947
+pid:105846744 ecl:gry cid:134 eyr:2027
+
+pid:252016128 hcl:9016ff cid:158 hgt:161 ecl:gry
+byr:1952 eyr:1955 iyr:2018
+
+iyr:2020 hgt:154in byr:1958
+eyr:2029 ecl:#2feb89 pid:99780178
+
+hcl:z
+eyr:2001 ecl:gmt
+byr:2022 hgt:73in iyr:2029
+pid:388744230
+
+hgt:186cm
+byr:1939 pid:622948608 ecl:oth eyr:2030
+hcl:#c0946f
+
+cid:272
+eyr:2025 byr:1979 ecl:brn hgt:180cm pid:456545466
+hcl:#fffffd iyr:2012
+
+pid:946657041 byr:1999
+iyr:2014 hcl:#ceb3a1 hgt:150cm
+ecl:grn
+
+byr:1957 pid:177cm ecl:blu eyr:2020 hcl:#cfa07d
+iyr:2010 hgt:183cm
+
+pid:161cm eyr:2025 hcl:#b6652a
+cid:213
+ecl:xry
+hgt:150cm
+iyr:2024 byr:2012
+
+hcl:ea1960
+ecl:grn
+pid:#7127b2 iyr:2012 eyr:2011 hgt:150
+
+pid:178699291
+hgt:66in eyr:2027
+byr:1985 iyr:2014 ecl:amb
+
+iyr:2017 ecl:blu
+eyr:2027 hgt:191cm byr:1990 hcl:#b6652a pid:074411798
+
+pid:528782860
+hgt:181cm hcl:#c0946f byr:1965 iyr:2012 ecl:grn eyr:2020
+
+pid:#ba10da hgt:176in byr:2006
+ecl:grt
+iyr:2030 eyr:1949 hcl:d3ca76
+
+hgt:66cm ecl:#898478 hcl:#e9f7a5 eyr:2030 iyr:2022
+byr:2025
+pid:159cm
+
+byr:1994 hcl:#ceb3a1
+pid:028071950 eyr:2022 ecl:gmt hgt:151in iyr:2016
+
+byr:2001 iyr:2011
+ecl:brn
+pid:487702556 hcl:#602927
+hgt:167cm eyr:2026
+
+# The above line MUST be blank
diff --git a/2020/04/puzzle-1.awk b/2020/04/puzzle-1.awk
new file mode 100755
index 0000000..4c0c474
--- /dev/null
+++ b/2020/04/puzzle-1.awk
@@ -0,0 +1,30 @@
+#!/usr/bin/env -S awk -f
+
+length == 0 {
+	valid = 1
+	for (i in fields) {
+		if (fields[i] == "")
+			valid = 0
+	}
+
+	if (valid)
+		count++
+
+	fields["byr"] = ""
+	fields["iyr"] = ""
+	fields["eyr"] = ""
+	fields["hgt"] = ""
+	fields["hcl"] = ""
+	fields["ecl"] = ""
+	fields["pid"] = ""
+}
+
+{
+	for (i = 1; i <= NF; i++) {
+		split($i, data, ":")
+		fields[data[1]] = data[2]
+	}
+}
+
+# Why do I need to subtract one? This code is so old I can't remember
+END { print count - 1 }
diff --git a/2020/04/puzzle-2.awk b/2020/04/puzzle-2.awk
new file mode 100755
index 0000000..bb88145
--- /dev/null
+++ b/2020/04/puzzle-2.awk
@@ -0,0 +1,67 @@
+#!/usr/bin/env -S awk -f
+
+function between(x, l, h)
+{
+	return (x >= l) && (x <= h)
+}
+
+BEGIN {
+	eyecolor[1] = "amb"
+	eyecolor[2] = "blu"
+	eyecolor[3] = "brn"
+	eyecolor[4] = "gry"
+	eyecolor[5] = "grn"
+	eyecolor[6] = "hzl"
+	eyecolor[7] = "oth"
+}
+
+length == 0 {
+	valid = 1
+
+	if (!(between(fields["byr"], 1920, 2002) && between(fields["iyr"], 2010, 2020) &&
+			between(fields["eyr"], 2020, 2030) && length(fields["pid"]) == 9))
+		valid = 0
+	else {
+		# Test eyecolor
+		valid = 0
+		for (i in eyecolor) {
+			if (fields["ecl"] == eyecolor[i]) {
+				valid = 1
+				break
+			}
+		}
+
+		# Test height
+		split(fields["hgt"], height, "[^0-9]")
+		if ((fields["hgt"] ~ "cm" && !between(height[1], 150, 193)) ||
+				(fields["hgt"] ~ "in" && !between(height[1], 59, 76)) ||
+				(fields["hgt"] !~ "cm|in"))
+			valid = 0
+
+		# Test haircolor
+		if (fields["hcl"] !~ "^#[0-9a-f]{6}")
+			valid = 0
+	}
+
+	if (valid == 1)
+		count++
+
+	fields["byr"] = ""
+	fields["iyr"] = ""
+	fields["eyr"] = ""
+	fields["hgt"] = ""
+	fields["hcl"] = ""
+	fields["ecl"] = ""
+	fields["pid"] = ""
+	next
+}
+
+# Non-blank lines
+{
+	for (i = 1; i <= NF; i++) {
+		split($i, data, ":")
+		fields[data[1]] = data[2]
+	}
+}
+
+END { print count }
diff --git a/2020/05/.gitignore b/2020/05/.gitignore
new file mode 100644
index 0000000..e2451f9
--- /dev/null
+++ b/2020/05/.gitignore
@@ -0,0 +1 @@
+seatids
diff --git a/2020/05/Makefile b/2020/05/Makefile
new file mode 100644
index 0000000..48f7dd4
--- /dev/null
+++ b/2020/05/Makefile
@@ -0,0 +1,6 @@
+all:
+	${CC} ${CFLAGS} -o seatids seatids.c
+
+.PHONY: clean
+clean:
+	rm -f seatids
diff --git a/2020/05/input b/2020/05/input
new file mode 100644
index 0000000..e3bc909
--- /dev/null
+++ b/2020/05/input
@@ -0,0 +1,908 @@
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\ No newline at end of file
diff --git a/2020/05/puzzle-1.awk b/2020/05/puzzle-1.awk
new file mode 100644
index 0000000..831c127
--- /dev/null
+++ b/2020/05/puzzle-1.awk
@@ -0,0 +1,2 @@
+$0 > max { max = $0 }
+END      { print max }
diff --git a/2020/05/puzzle-2.awk b/2020/05/puzzle-2.awk
new file mode 100644
index 0000000..8b9b823
--- /dev/null
+++ b/2020/05/puzzle-2.awk
@@ -0,0 +1,11 @@
+{ ids[NR] = $0 }
+
+END {
+	n = asort(ids)
+	for (i = 1; i <= n; i++) {
+		if ((i + 35) != ids[i]) {
+			print i + 35
+			exit
+		}
+	}
+}
diff --git a/2020/05/puzzles.sh b/2020/05/puzzles.sh
new file mode 100755
index 0000000..2066d76
--- /dev/null
+++ b/2020/05/puzzles.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+./seatids | awk -f puzzle-1.awk
+./seatids | gawk -f puzzle-2.awk
diff --git a/2020/05/seatids.c b/2020/05/seatids.c
new file mode 100644
index 0000000..9c3b797
--- /dev/null
+++ b/2020/05/seatids.c
@@ -0,0 +1,37 @@
+#include <math.h>
+#include <stdio.h>
+
+/* Parse the input file `input` and print out all of the seat IDs which can be piped into both awk
+ * scripts
+ */
+int
+main(void)
+{
+	FILE *fpt = fopen("input", "r");
+	/* +2 for \n and \0 */
+	char bpass[12];
+	while (fgets(bpass, 12, fpt) != NULL) {
+		int lower_r = 0;
+		int upper_r = 127;
+		for (int i = 0; i < 7; i++) {
+			if (bpass[i] == 'F')
+				upper_r = (upper_r + lower_r) / 2;
+			else
+				lower_r = round((upper_r + lower_r) / 2);
+		}
+
+		int lower_c = 0;
+		int upper_c = 7;
+		for (int i = 7; i < 10; i++) {
+			if (bpass[i] == 'L')
+				upper_c = (upper_c + lower_c) / 2;
+			else
+				lower_c = round((upper_c + lower_c) / 2);
+		}
+
+		int seat_id = upper_r * 8 + upper_c;
+		printf("%d\n", seat_id);
+	}
+
+	return 0;
+}
diff --git a/2020/06/input b/2020/06/input
new file mode 100644
index 0000000..7153597
--- /dev/null
+++ b/2020/06/input
@@ -0,0 +1,2167 @@
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\ No newline at end of file
diff --git a/2020/06/puzzle-1.awk b/2020/06/puzzle-1.awk
new file mode 100755
index 0000000..71d55a8
--- /dev/null
+++ b/2020/06/puzzle-1.awk
@@ -0,0 +1,14 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN { RS = "" }
+{
+	split($0, chars, "")
+	for (i = 1; i <= length; i++) {
+		if (chars[i] != "\n")
+			answers[chars[i]] = 1
+	}
+
+	sum += length(answers)
+	delete answers
+}
+END   { print sum }
diff --git a/2020/06/puzzle-2.awk b/2020/06/puzzle-2.awk
new file mode 100755
index 0000000..98224ac
--- /dev/null
+++ b/2020/06/puzzle-2.awk
@@ -0,0 +1,23 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN {
+	RS = ""
+	FS = "\n"
+}
+
+{
+	for (i = 1; i <= NF; i++) {
+		len = split($i, answers, "")
+		for (j = 1; j <= len; j++)
+			count[answers[j]]++
+	}
+
+	for (i in count) {
+		if (count[i] == NF)
+			sum++
+	}
+
+	delete count
+}
+
+END { print sum }
diff --git a/2020/07/input b/2020/07/input
new file mode 100644
index 0000000..4e9e60a
--- /dev/null
+++ b/2020/07/input
@@ -0,0 +1,594 @@
+dotted salmon bags contain 2 dark lavender bags, 1 muted red bag, 1 vibrant magenta bag.
+vibrant purple bags contain 1 pale cyan bag, 1 dotted lavender bag, 3 striped blue bags, 5 clear magenta bags.
+vibrant fuchsia bags contain 4 posh violet bags, 3 bright aqua bags, 1 light silver bag.
+mirrored purple bags contain 2 dim yellow bags, 4 dim green bags, 3 vibrant beige bags.
+faded coral bags contain 1 vibrant plum bag, 3 pale gold bags, 5 dim purple bags, 1 drab teal bag.
+wavy cyan bags contain 4 dark teal bags, 1 dotted magenta bag.
+dotted gold bags contain 3 dotted gray bags.
+shiny maroon bags contain 2 light white bags, 5 bright salmon bags.
+vibrant cyan bags contain 2 dull beige bags.
+clear fuchsia bags contain 5 bright bronze bags.
+clear violet bags contain 4 clear white bags, 2 drab fuchsia bags, 4 plaid lavender bags, 4 drab beige bags.
+wavy tomato bags contain 3 wavy yellow bags, 4 plaid maroon bags, 1 dark beige bag.
+shiny indigo bags contain 4 posh aqua bags, 2 dim salmon bags, 3 dotted olive bags, 1 dull gray bag.
+dotted indigo bags contain 3 muted bronze bags, 1 striped salmon bag, 5 vibrant violet bags, 3 drab crimson bags.
+mirrored magenta bags contain 1 shiny aqua bag.
+pale green bags contain 4 striped orange bags, 3 plaid red bags, 3 clear olive bags.
+dim crimson bags contain 5 posh violet bags, 3 mirrored crimson bags, 2 striped white bags, 1 dark indigo bag.
+light white bags contain 1 dark indigo bag, 1 wavy orange bag.
+striped green bags contain 2 clear beige bags, 4 dim coral bags.
+dotted lavender bags contain 1 striped white bag, 5 dotted coral bags, 3 striped orange bags, 1 dotted gray bag.
+light purple bags contain 5 dim tomato bags, 4 dull plum bags, 1 dim green bag, 3 dotted magenta bags.
+shiny violet bags contain 1 shiny white bag.
+dark lime bags contain 4 mirrored crimson bags, 2 wavy crimson bags, 4 dim green bags.
+dark teal bags contain 3 mirrored orange bags.
+muted maroon bags contain 5 dim fuchsia bags.
+posh tomato bags contain 3 bright violet bags, 3 dim crimson bags, 4 mirrored beige bags, 3 drab lime bags.
+plaid violet bags contain 1 shiny tomato bag, 5 dotted gray bags, 1 muted magenta bag, 5 mirrored crimson bags.
+shiny bronze bags contain 3 dim red bags, 2 drab plum bags, 3 striped yellow bags, 1 mirrored yellow bag.
+muted tomato bags contain 2 vibrant maroon bags, 3 vibrant beige bags, 5 light coral bags.
+muted fuchsia bags contain 2 clear violet bags, 4 shiny gray bags, 1 shiny gold bag, 3 wavy crimson bags.
+pale teal bags contain 2 bright beige bags, 3 vibrant cyan bags, 4 bright salmon bags, 3 plaid red bags.
+posh salmon bags contain 2 dull beige bags, 1 faded maroon bag.
+dim white bags contain 2 dull tan bags, 3 dotted coral bags, 1 light silver bag, 1 dim gold bag.
+posh tan bags contain 4 clear blue bags, 4 dim olive bags, 4 striped green bags.
+dim lime bags contain 2 drab chartreuse bags, 5 striped magenta bags, 4 striped purple bags.
+mirrored white bags contain 2 dotted white bags, 3 striped salmon bags, 3 dull green bags, 3 plaid orange bags.
+shiny fuchsia bags contain 3 striped bronze bags, 1 plaid violet bag.
+dull indigo bags contain 5 wavy tomato bags.
+posh maroon bags contain 2 dark green bags, 4 posh red bags, 3 drab tomato bags.
+clear coral bags contain 5 pale yellow bags, 2 muted green bags, 3 faded black bags, 1 striped teal bag.
+posh gold bags contain 3 wavy yellow bags, 5 mirrored crimson bags, 1 dotted lavender bag, 2 plaid purple bags.
+muted yellow bags contain 3 wavy tan bags, 1 dark beige bag, 3 drab lavender bags.
+pale cyan bags contain 5 clear black bags, 3 dull lime bags, 3 wavy olive bags, 5 plaid indigo bags.
+drab white bags contain 2 dull green bags, 3 wavy aqua bags, 4 dark indigo bags.
+drab lime bags contain 2 drab aqua bags, 5 light turquoise bags.
+dotted tan bags contain 1 dotted beige bag, 5 faded maroon bags, 5 light indigo bags, 3 light bronze bags.
+muted crimson bags contain 5 faded gold bags.
+striped turquoise bags contain 1 shiny silver bag, 4 vibrant salmon bags, 5 dotted yellow bags.
+plaid yellow bags contain 2 dim crimson bags, 5 bright tan bags, 3 wavy yellow bags, 1 clear silver bag.
+shiny salmon bags contain 2 vibrant yellow bags.
+pale maroon bags contain 5 faded silver bags, 3 dull lavender bags, 4 dotted magenta bags.
+dotted orange bags contain 4 mirrored brown bags, 2 clear fuchsia bags.
+muted gray bags contain 5 dim purple bags, 3 wavy yellow bags.
+vibrant gold bags contain 2 wavy maroon bags, 5 faded chartreuse bags, 3 light indigo bags, 4 dark brown bags.
+bright fuchsia bags contain 4 pale crimson bags, 3 striped orange bags, 1 shiny tomato bag, 5 bright tan bags.
+light cyan bags contain 1 dim teal bag, 3 wavy indigo bags.
+pale olive bags contain 3 light fuchsia bags.
+dim brown bags contain 2 dotted indigo bags.
+mirrored silver bags contain 3 plaid violet bags.
+posh cyan bags contain 5 wavy maroon bags, 4 dim gold bags.
+bright turquoise bags contain 5 posh bronze bags, 4 shiny aqua bags.
+faded fuchsia bags contain 3 dotted gray bags.
+dull beige bags contain 3 posh bronze bags.
+dark purple bags contain 4 dim salmon bags, 4 faded maroon bags, 2 drab red bags, 1 clear bronze bag.
+drab tan bags contain 5 striped maroon bags.
+faded green bags contain 3 dark lavender bags, 4 posh lime bags, 2 light purple bags, 2 dark plum bags.
+posh indigo bags contain 4 dark tan bags, 2 dark lavender bags, 1 shiny cyan bag.
+drab maroon bags contain 3 wavy red bags, 1 dim fuchsia bag, 5 mirrored indigo bags, 2 drab lavender bags.
+dim magenta bags contain 4 striped orange bags.
+striped teal bags contain 2 dark lime bags.
+plaid green bags contain 5 mirrored salmon bags, 4 mirrored brown bags, 2 dark lavender bags, 4 faded indigo bags.
+dull blue bags contain 3 faded lime bags, 2 faded violet bags, 4 dull tan bags, 1 shiny tan bag.
+muted turquoise bags contain 5 dim silver bags, 4 wavy crimson bags.
+dull teal bags contain 1 faded blue bag, 3 light violet bags, 3 faded black bags.
+mirrored salmon bags contain 4 muted magenta bags, 3 dotted tomato bags, 2 light cyan bags, 2 vibrant lavender bags.
+shiny coral bags contain 1 striped teal bag, 1 drab lime bag, 5 mirrored red bags.
+muted chartreuse bags contain 2 striped white bags, 3 bright turquoise bags, 2 faded silver bags.
+mirrored green bags contain 2 bright maroon bags.
+light brown bags contain 2 clear bronze bags, 4 dark lime bags, 3 muted teal bags, 5 wavy yellow bags.
+vibrant indigo bags contain 3 dotted bronze bags.
+light coral bags contain 2 dotted bronze bags.
+dotted turquoise bags contain 3 plaid red bags, 3 shiny fuchsia bags, 4 faded lime bags.
+dark white bags contain 1 dull blue bag, 5 shiny cyan bags, 3 dark beige bags, 2 mirrored brown bags.
+pale purple bags contain 5 faded gold bags, 2 drab maroon bags.
+wavy beige bags contain 3 faded violet bags, 4 mirrored silver bags, 4 clear gray bags, 2 dotted tomato bags.
+light teal bags contain 4 bright magenta bags, 2 drab coral bags.
+bright tomato bags contain 3 mirrored crimson bags, 1 muted blue bag, 4 dim brown bags.
+plaid turquoise bags contain 4 vibrant blue bags, 1 wavy chartreuse bag, 2 pale magenta bags.
+faded tomato bags contain 3 light salmon bags, 2 wavy chartreuse bags.
+faded salmon bags contain 5 dark aqua bags, 4 faded bronze bags, 5 bright crimson bags.
+light salmon bags contain 2 mirrored silver bags, 3 dotted coral bags, 3 wavy crimson bags.
+mirrored lavender bags contain 4 shiny silver bags, 1 wavy crimson bag.
+vibrant plum bags contain 5 light orange bags, 4 dull lime bags, 2 dim aqua bags, 5 shiny violet bags.
+vibrant tan bags contain 1 drab salmon bag, 2 dull beige bags, 3 dotted bronze bags.
+faded red bags contain 3 light indigo bags, 2 dotted tomato bags.
+bright purple bags contain 3 light tomato bags, 3 clear gold bags.
+plaid magenta bags contain 5 muted orange bags, 3 pale plum bags, 5 faded plum bags.
+wavy tan bags contain 1 dull lavender bag.
+faded olive bags contain 5 mirrored silver bags.
+plaid white bags contain 4 bright bronze bags, 2 dotted cyan bags, 2 dark lavender bags, 5 shiny lavender bags.
+striped aqua bags contain 5 light salmon bags.
+drab tomato bags contain 1 dark lime bag, 2 muted magenta bags, 5 clear gray bags, 3 dotted gray bags.
+clear tomato bags contain 5 plaid bronze bags.
+posh teal bags contain 1 plaid maroon bag, 3 light tan bags, 1 clear crimson bag, 5 vibrant aqua bags.
+dim tan bags contain 2 drab fuchsia bags, 3 dark beige bags, 3 plaid green bags.
+dotted lime bags contain 4 dim red bags.
+mirrored beige bags contain 1 bright orange bag, 3 light purple bags.
+plaid silver bags contain 2 bright gold bags.
+faded orange bags contain 5 faded plum bags.
+dim indigo bags contain 4 muted orange bags, 5 vibrant tomato bags.
+shiny blue bags contain 3 drab crimson bags, 2 dim green bags, 1 clear violet bag.
+dull olive bags contain 2 plaid lime bags, 5 muted maroon bags, 4 shiny crimson bags, 3 dim plum bags.
+striped maroon bags contain 1 dim tomato bag, 2 dotted tomato bags, 1 muted magenta bag, 5 faded maroon bags.
+dull green bags contain 4 light salmon bags, 1 dim green bag.
+vibrant crimson bags contain 4 clear plum bags, 2 faded white bags, 4 wavy crimson bags.
+striped chartreuse bags contain 2 plaid lavender bags.
+bright chartreuse bags contain 2 vibrant orange bags.
+drab lavender bags contain 4 dotted coral bags.
+dull crimson bags contain 2 faded silver bags, 2 bright magenta bags.
+striped magenta bags contain 4 dull crimson bags, 4 faded maroon bags.
+clear bronze bags contain 1 bright bronze bag, 2 shiny red bags.
+plaid tan bags contain 5 pale silver bags, 5 muted teal bags, 3 faded beige bags, 2 faded chartreuse bags.
+dim black bags contain 2 faded indigo bags.
+shiny black bags contain 3 dotted bronze bags, 5 clear olive bags, 3 dark orange bags, 4 pale coral bags.
+striped gold bags contain 3 dotted coral bags, 4 faded orange bags, 2 striped purple bags, 4 light cyan bags.
+drab chartreuse bags contain 4 dull crimson bags.
+bright yellow bags contain 3 wavy crimson bags, 4 bright turquoise bags, 3 plaid red bags.
+dark orange bags contain 3 wavy yellow bags.
+clear salmon bags contain 5 wavy turquoise bags, 4 shiny aqua bags, 1 shiny brown bag, 1 vibrant tomato bag.
+plaid fuchsia bags contain 1 posh olive bag.
+wavy magenta bags contain 5 vibrant beige bags, 5 faded chartreuse bags, 5 light purple bags, 4 wavy indigo bags.
+dull gold bags contain 2 shiny bronze bags, 4 plaid beige bags, 4 mirrored silver bags, 2 bright lavender bags.
+drab magenta bags contain 1 posh red bag.
+shiny silver bags contain 4 dark lavender bags, 2 dull tan bags.
+shiny crimson bags contain 3 plaid violet bags, 4 muted purple bags.
+posh black bags contain 2 dotted magenta bags, 4 dotted gray bags.
+vibrant salmon bags contain 1 clear silver bag.
+dotted tomato bags contain 4 wavy crimson bags, 3 faded plum bags, 4 muted magenta bags.
+dark turquoise bags contain 1 dim beige bag, 3 dotted coral bags.
+pale orange bags contain 2 striped silver bags, 1 dotted salmon bag, 3 dim black bags, 4 posh turquoise bags.
+mirrored indigo bags contain 5 posh yellow bags.
+muted lavender bags contain 5 striped olive bags, 1 muted indigo bag.
+light yellow bags contain 5 dark chartreuse bags.
+drab bronze bags contain 3 clear beige bags, 3 bright purple bags, 3 bright brown bags.
+mirrored blue bags contain 5 dotted bronze bags, 1 dark green bag, 5 clear silver bags, 5 dim maroon bags.
+wavy violet bags contain 4 light tan bags, 1 vibrant lavender bag.
+clear red bags contain 4 faded orange bags, 1 drab gold bag, 4 dim teal bags, 4 dotted indigo bags.
+striped indigo bags contain 5 dim indigo bags.
+striped olive bags contain 3 dotted green bags, 4 mirrored cyan bags.
+dim fuchsia bags contain 3 vibrant gray bags, 5 wavy brown bags, 2 muted beige bags.
+plaid plum bags contain 3 shiny tomato bags, 4 striped orange bags.
+striped white bags contain 1 plaid red bag.
+mirrored coral bags contain 5 drab teal bags, 4 dotted coral bags, 4 striped chartreuse bags, 5 dotted gold bags.
+dull bronze bags contain 4 dim olive bags, 5 posh turquoise bags, 2 clear gold bags.
+pale white bags contain 3 vibrant gray bags, 4 wavy coral bags, 5 drab purple bags.
+drab green bags contain 1 dim teal bag, 1 faded bronze bag, 3 clear silver bags.
+dotted black bags contain 3 drab tan bags, 2 vibrant orange bags, 3 striped maroon bags.
+light gold bags contain 5 posh olive bags, 3 striped orange bags, 3 dull orange bags.
+pale tan bags contain 1 mirrored fuchsia bag, 4 light silver bags, 5 dim plum bags.
+plaid lavender bags contain 1 dim teal bag, 5 shiny aqua bags, 5 wavy crimson bags.
+wavy lime bags contain 1 pale chartreuse bag, 5 mirrored white bags, 4 faded olive bags.
+bright crimson bags contain 1 plaid green bag.
+pale fuchsia bags contain 4 light aqua bags.
+striped crimson bags contain 4 shiny plum bags, 3 dull violet bags, 5 clear tan bags.
+mirrored fuchsia bags contain 3 posh red bags, 3 plaid violet bags, 5 shiny brown bags, 5 striped chartreuse bags.
+faded cyan bags contain 3 striped yellow bags, 3 clear indigo bags.
+mirrored plum bags contain 2 vibrant silver bags.
+dull turquoise bags contain 2 plaid white bags, 5 striped salmon bags, 5 clear purple bags.
+dim orange bags contain 5 dim black bags.
+dull orange bags contain 3 dotted magenta bags, 2 mirrored crimson bags, 3 striped bronze bags.
+dark gray bags contain 4 dotted crimson bags, 2 vibrant salmon bags.
+drab orange bags contain 5 dotted gray bags, 5 muted maroon bags, 5 faded aqua bags, 2 pale maroon bags.
+striped bronze bags contain 3 striped white bags, 5 striped orange bags.
+light bronze bags contain 2 plaid red bags, 2 faded olive bags.
+drab olive bags contain 2 striped salmon bags, 3 drab white bags, 4 pale silver bags.
+bright cyan bags contain 5 muted blue bags.
+drab black bags contain 1 shiny blue bag, 1 drab yellow bag, 5 muted tan bags, 2 drab violet bags.
+shiny green bags contain 5 dim purple bags, 1 dotted crimson bag.
+wavy blue bags contain 3 shiny white bags.
+pale lime bags contain 1 dotted maroon bag.
+dotted red bags contain 1 dotted bronze bag, 1 vibrant lime bag, 4 clear plum bags.
+faded bronze bags contain 4 pale magenta bags, 1 faded black bag, 1 faded orange bag, 3 dark crimson bags.
+dark green bags contain 1 striped magenta bag.
+faded blue bags contain 2 dim maroon bags.
+dim violet bags contain 4 posh yellow bags, 5 dim lime bags, 5 faded olive bags.
+dark tan bags contain 2 mirrored green bags.
+dim teal bags contain 5 mirrored yellow bags, 2 dull tan bags, 2 vibrant lavender bags, 4 clear lime bags.
+plaid crimson bags contain 3 striped black bags, 1 faded plum bag, 3 muted red bags.
+clear white bags contain 1 shiny gold bag.
+dim silver bags contain 5 dull tan bags.
+dark cyan bags contain 2 clear black bags, 5 plaid yellow bags, 2 posh coral bags.
+dull violet bags contain 5 wavy teal bags, 5 shiny white bags.
+muted coral bags contain 5 faded violet bags, 2 drab red bags, 3 muted olive bags, 4 mirrored tomato bags.
+vibrant white bags contain 3 muted brown bags, 4 mirrored red bags, 4 dull orange bags, 4 dark crimson bags.
+posh red bags contain 2 clear gray bags, 2 bright turquoise bags.
+wavy chartreuse bags contain 5 light tomato bags, 5 posh black bags.
+striped black bags contain 1 faded green bag, 1 wavy green bag, 4 wavy orange bags.
+drab indigo bags contain 4 clear cyan bags, 4 mirrored crimson bags, 4 clear silver bags.
+pale gold bags contain 1 dim lime bag.
+dark olive bags contain 5 bright white bags, 5 clear lavender bags, 2 vibrant coral bags.
+muted salmon bags contain 4 drab beige bags, 3 plaid violet bags, 4 mirrored brown bags, 3 dark lime bags.
+posh gray bags contain 1 clear beige bag, 4 vibrant blue bags, 1 shiny aqua bag, 5 dim tan bags.
+bright white bags contain 5 muted bronze bags, 5 clear cyan bags.
+dull white bags contain 1 vibrant tomato bag.
+striped tan bags contain 4 mirrored brown bags, 5 faded chartreuse bags.
+wavy teal bags contain 3 plaid red bags.
+faded purple bags contain 4 muted orange bags, 3 clear salmon bags, 5 drab cyan bags.
+dotted yellow bags contain 4 light indigo bags, 5 drab violet bags, 3 dull tan bags, 3 bright lime bags.
+wavy plum bags contain 2 dim aqua bags, 5 dark brown bags, 1 bright gold bag, 2 dull orange bags.
+muted blue bags contain 5 plaid tan bags, 4 dim salmon bags, 5 striped tomato bags.
+dim green bags contain no other bags.
+light lime bags contain 3 mirrored orange bags, 2 muted red bags, 1 dim black bag, 4 posh maroon bags.
+mirrored brown bags contain 4 dotted gray bags, 3 clear lime bags, 2 dim green bags.
+drab fuchsia bags contain 5 mirrored yellow bags, 5 plaid plum bags.
+drab gray bags contain 2 dim violet bags, 4 posh purple bags.
+vibrant teal bags contain 4 pale tomato bags, 2 posh lime bags, 2 mirrored silver bags, 1 wavy crimson bag.
+dotted plum bags contain 5 bright gold bags.
+shiny gold bags contain 4 shiny tomato bags, 5 wavy indigo bags.
+bright bronze bags contain 2 faded maroon bags, 2 dim white bags, 5 drab violet bags.
+drab yellow bags contain 4 mirrored green bags, 5 faded fuchsia bags, 1 drab turquoise bag.
+dark bronze bags contain 5 muted salmon bags, 3 posh cyan bags, 2 shiny tan bags.
+light magenta bags contain 3 dark silver bags, 2 striped tan bags.
+pale yellow bags contain 5 drab tomato bags, 3 striped orange bags, 4 striped maroon bags.
+shiny cyan bags contain 2 light tomato bags, 3 clear purple bags, 2 shiny tan bags, 3 dull tan bags.
+pale gray bags contain 2 drab purple bags, 5 dotted turquoise bags, 3 pale salmon bags.
+mirrored cyan bags contain 4 faded chartreuse bags.
+dotted bronze bags contain 2 faded silver bags.
+faded beige bags contain 1 bright red bag, 3 dotted red bags, 2 striped lime bags.
+dotted beige bags contain 4 muted turquoise bags, 1 dull beige bag, 3 bright gold bags.
+drab plum bags contain 4 clear chartreuse bags.
+pale blue bags contain 1 dim chartreuse bag, 1 dark lavender bag, 1 drab tan bag.
+faded teal bags contain 1 vibrant tan bag, 1 dim tan bag, 3 dull gray bags, 4 plaid red bags.
+plaid beige bags contain 3 plaid tomato bags.
+dotted chartreuse bags contain 1 pale maroon bag.
+bright gray bags contain 2 bright coral bags, 3 bright turquoise bags, 4 posh tan bags.
+bright olive bags contain 1 dotted bronze bag, 4 mirrored yellow bags, 4 light bronze bags.
+dotted olive bags contain 5 clear purple bags, 5 muted bronze bags, 5 vibrant tomato bags.
+pale tomato bags contain 4 clear gold bags, 4 clear tomato bags.
+clear gold bags contain 1 striped lime bag, 1 striped chartreuse bag, 2 muted fuchsia bags, 5 clear salmon bags.
+dotted gray bags contain no other bags.
+striped brown bags contain 3 pale maroon bags, 5 faded gold bags, 4 wavy yellow bags, 3 bright turquoise bags.
+shiny lime bags contain 4 pale violet bags, 4 clear violet bags.
+mirrored tan bags contain 1 vibrant magenta bag, 3 mirrored violet bags, 5 faded plum bags.
+dull maroon bags contain 5 posh salmon bags, 5 dull coral bags, 2 plaid plum bags, 3 striped teal bags.
+dim purple bags contain 1 light tomato bag, 3 shiny violet bags.
+bright brown bags contain 1 shiny aqua bag, 1 shiny lavender bag, 1 drab fuchsia bag, 3 faded olive bags.
+light maroon bags contain 4 mirrored brown bags.
+pale violet bags contain 4 wavy turquoise bags, 5 dull orange bags, 4 dotted black bags, 5 muted fuchsia bags.
+mirrored black bags contain 3 dotted silver bags, 2 bright crimson bags.
+drab aqua bags contain 3 plaid red bags, 1 plaid violet bag, 5 dim tomato bags.
+clear green bags contain 4 dark coral bags.
+mirrored aqua bags contain 4 shiny crimson bags, 4 wavy bronze bags.
+pale coral bags contain 2 wavy olive bags, 2 muted silver bags, 4 dim tan bags.
+mirrored gray bags contain 5 clear plum bags, 5 dark yellow bags.
+light blue bags contain 3 dull bronze bags, 3 dotted plum bags.
+dark silver bags contain 2 plaid chartreuse bags, 5 plaid lavender bags, 1 wavy indigo bag, 4 dark brown bags.
+posh silver bags contain 4 shiny lavender bags.
+shiny orange bags contain 4 light magenta bags.
+dark blue bags contain 5 pale purple bags.
+wavy white bags contain 1 posh olive bag, 1 dotted fuchsia bag, 4 muted maroon bags.
+striped orange bags contain 2 faded plum bags.
+dull lime bags contain 1 pale yellow bag, 1 clear turquoise bag, 5 faded silver bags, 4 dim beige bags.
+dull red bags contain 1 bright aqua bag, 3 light maroon bags, 5 light tomato bags.
+light tomato bags contain 3 dull crimson bags, 1 dim beige bag.
+bright blue bags contain 3 plaid olive bags.
+bright red bags contain 4 muted teal bags, 5 dotted magenta bags.
+striped gray bags contain 2 dotted purple bags, 4 dull green bags, 4 dull salmon bags, 4 muted silver bags.
+drab salmon bags contain 4 mirrored indigo bags, 5 mirrored silver bags, 5 shiny cyan bags, 1 plaid brown bag.
+posh olive bags contain 3 faded silver bags, 5 plaid violet bags, 2 striped bronze bags.
+dim salmon bags contain 5 vibrant lavender bags.
+mirrored orange bags contain 2 bright white bags, 5 plaid orange bags.
+posh fuchsia bags contain 5 vibrant coral bags, 2 shiny plum bags, 5 pale silver bags.
+wavy fuchsia bags contain 5 posh cyan bags, 2 bright silver bags, 1 wavy tomato bag, 1 wavy plum bag.
+clear olive bags contain 4 pale maroon bags, 2 muted bronze bags, 4 mirrored crimson bags, 2 dull blue bags.
+clear blue bags contain 5 shiny white bags, 5 plaid lime bags.
+dotted coral bags contain no other bags.
+clear black bags contain 4 dull beige bags, 2 mirrored crimson bags, 2 dim beige bags.
+mirrored turquoise bags contain 2 light green bags, 4 dull lime bags, 2 drab olive bags, 3 drab purple bags.
+muted teal bags contain 2 dim gold bags, 1 light salmon bag, 3 dark crimson bags, 3 muted olive bags.
+clear gray bags contain 2 dotted coral bags, 5 shiny tomato bags.
+vibrant black bags contain 2 dull blue bags, 1 light magenta bag.
+clear yellow bags contain 3 vibrant yellow bags, 2 plaid red bags, 1 dull plum bag, 4 faded violet bags.
+dull fuchsia bags contain 4 dim maroon bags, 4 wavy plum bags, 5 dim teal bags.
+mirrored gold bags contain 4 mirrored brown bags, 3 dotted coral bags, 4 faded plum bags, 1 mirrored indigo bag.
+faded lime bags contain 3 plaid violet bags, 2 drab tan bags.
+wavy olive bags contain 3 muted silver bags, 1 pale maroon bag, 5 posh silver bags.
+pale bronze bags contain 2 striped purple bags, 5 bright magenta bags, 4 pale crimson bags.
+posh crimson bags contain 4 mirrored purple bags, 2 shiny silver bags, 4 bright tan bags.
+clear plum bags contain 1 mirrored indigo bag, 4 clear purple bags, 2 dull blue bags, 5 striped bronze bags.
+vibrant chartreuse bags contain 5 vibrant yellow bags, 1 faded red bag.
+plaid red bags contain no other bags.
+dim maroon bags contain 2 pale yellow bags, 4 dotted cyan bags.
+pale silver bags contain 2 dark crimson bags.
+bright magenta bags contain 5 plaid red bags, 4 faded maroon bags.
+dark crimson bags contain 2 bright magenta bags, 1 mirrored silver bag, 2 mirrored brown bags, 1 shiny lavender bag.
+dull yellow bags contain 1 dull salmon bag.
+dark maroon bags contain 5 muted turquoise bags.
+clear indigo bags contain 5 posh purple bags, 3 striped magenta bags.
+shiny olive bags contain 3 drab yellow bags.
+vibrant bronze bags contain 4 plaid indigo bags.
+light plum bags contain 5 faded aqua bags.
+dim lavender bags contain 3 drab purple bags, 2 clear salmon bags, 1 wavy bronze bag, 1 plaid tan bag.
+mirrored chartreuse bags contain 3 wavy plum bags, 2 muted tan bags.
+bright teal bags contain 2 bright lavender bags, 5 plaid plum bags, 3 clear bronze bags.
+dull tan bags contain 4 clear gray bags.
+shiny magenta bags contain 2 plaid gold bags, 2 dotted turquoise bags, 4 muted teal bags, 3 shiny gold bags.
+clear aqua bags contain 4 dim cyan bags, 3 dim plum bags, 5 dim violet bags, 1 plaid yellow bag.
+clear tan bags contain 1 shiny brown bag.
+faded lavender bags contain 3 faded white bags, 1 faded purple bag.
+plaid maroon bags contain 5 plaid orange bags, 4 striped green bags, 2 striped gold bags, 5 bright bronze bags.
+wavy lavender bags contain 5 dim black bags, 5 clear fuchsia bags.
+plaid olive bags contain 3 dotted crimson bags, 2 pale plum bags, 3 bright orange bags, 1 clear coral bag.
+shiny lavender bags contain 3 faded plum bags, 2 mirrored crimson bags, 5 striped orange bags, 5 bright magenta bags.
+plaid chartreuse bags contain 5 clear silver bags, 5 pale crimson bags.
+bright coral bags contain 4 vibrant orange bags.
+wavy yellow bags contain 3 dull plum bags, 4 bright yellow bags, 5 mirrored violet bags, 3 plaid red bags.
+dark chartreuse bags contain 4 striped bronze bags, 2 bright tan bags.
+mirrored tomato bags contain 1 clear yellow bag, 1 dark lime bag, 2 mirrored silver bags.
+plaid gray bags contain 4 muted cyan bags, 4 dark silver bags, 1 wavy orange bag, 4 muted tomato bags.
+mirrored red bags contain 5 pale crimson bags, 5 light cyan bags, 1 posh yellow bag.
+vibrant silver bags contain 2 dull brown bags, 1 vibrant orange bag, 5 striped red bags.
+plaid purple bags contain 2 striped maroon bags, 1 faded olive bag.
+dull silver bags contain 4 shiny lavender bags, 5 plaid fuchsia bags, 1 plaid plum bag, 2 light cyan bags.
+dark plum bags contain 2 vibrant gold bags, 4 plaid brown bags, 1 drab teal bag, 4 dotted yellow bags.
+mirrored teal bags contain 3 drab orange bags, 4 shiny fuchsia bags, 4 mirrored lavender bags, 1 clear brown bag.
+light red bags contain 5 striped violet bags.
+shiny aqua bags contain 4 wavy indigo bags, 3 posh olive bags, 2 clear gray bags, 2 dim tomato bags.
+dull magenta bags contain 1 bright crimson bag, 1 bright bronze bag, 2 drab gold bags, 2 clear lavender bags.
+muted gold bags contain 1 striped chartreuse bag, 3 posh olive bags.
+dark brown bags contain 1 bright yellow bag.
+dull brown bags contain 5 dark brown bags, 1 dim gold bag.
+shiny chartreuse bags contain 1 shiny aqua bag, 5 faded chartreuse bags, 4 wavy beige bags.
+vibrant maroon bags contain 1 dotted yellow bag, 2 striped green bags, 2 muted olive bags, 2 muted turquoise bags.
+faded maroon bags contain 1 striped bronze bag, 5 dotted coral bags, 4 dim green bags, 1 faded plum bag.
+wavy salmon bags contain 1 dim white bag, 4 clear purple bags, 5 dark fuchsia bags, 5 vibrant cyan bags.
+light beige bags contain 3 dull lime bags, 1 plaid lavender bag.
+plaid teal bags contain 2 muted black bags, 2 dull salmon bags, 5 faded red bags, 2 muted turquoise bags.
+plaid cyan bags contain 5 faded maroon bags, 2 posh chartreuse bags.
+dim chartreuse bags contain 5 muted red bags, 4 dark lime bags.
+clear magenta bags contain 1 clear tomato bag, 1 striped orange bag, 3 striped chartreuse bags.
+dotted blue bags contain 5 plaid green bags, 3 mirrored crimson bags, 4 dotted magenta bags, 3 clear bronze bags.
+clear silver bags contain 4 vibrant lavender bags, 1 wavy turquoise bag, 2 posh purple bags, 5 dull blue bags.
+posh beige bags contain 4 muted aqua bags, 3 wavy orange bags, 1 muted coral bag.
+dim coral bags contain 1 clear purple bag, 2 plaid purple bags, 5 light gold bags.
+faded white bags contain 2 striped orange bags, 3 posh silver bags, 4 shiny tan bags, 5 faded green bags.
+pale aqua bags contain 5 shiny tan bags, 5 drab violet bags.
+clear brown bags contain 5 shiny tomato bags.
+faded tan bags contain 1 pale gray bag, 2 dull beige bags, 3 wavy teal bags, 1 bright maroon bag.
+striped silver bags contain 3 shiny green bags.
+vibrant brown bags contain 5 shiny aqua bags, 2 pale violet bags, 5 drab indigo bags.
+dark yellow bags contain 1 wavy white bag, 3 posh violet bags, 4 bright magenta bags.
+dull gray bags contain 3 dark silver bags, 3 mirrored green bags.
+dark violet bags contain 2 dark maroon bags, 5 dull aqua bags.
+muted brown bags contain 5 dim aqua bags, 3 dim teal bags, 4 faded olive bags, 1 plaid purple bag.
+posh chartreuse bags contain 3 dark tan bags, 1 striped salmon bag, 2 dark lime bags, 5 vibrant beige bags.
+mirrored maroon bags contain 1 dark red bag.
+faded yellow bags contain 5 mirrored beige bags, 1 drab chartreuse bag, 3 vibrant lavender bags.
+dotted aqua bags contain 4 vibrant lavender bags, 4 shiny fuchsia bags.
+bright maroon bags contain 5 faded maroon bags, 2 dark lime bags, 4 dim beige bags.
+dark salmon bags contain 5 clear tan bags.
+wavy bronze bags contain 3 dark beige bags.
+wavy crimson bags contain no other bags.
+drab gold bags contain 2 faded violet bags, 4 faded silver bags.
+dark black bags contain 3 wavy bronze bags, 2 dark aqua bags, 4 dotted beige bags.
+striped lavender bags contain 2 wavy aqua bags.
+vibrant red bags contain 1 plaid aqua bag.
+shiny yellow bags contain 5 clear silver bags, 2 dull magenta bags, 5 clear turquoise bags.
+dull chartreuse bags contain 5 light tan bags.
+bright beige bags contain 2 dim tomato bags.
+mirrored yellow bags contain 5 drab aqua bags, 5 mirrored silver bags, 3 dark lime bags.
+striped beige bags contain 4 dim white bags.
+muted orange bags contain 3 drab beige bags, 5 faded olive bags.
+drab turquoise bags contain 1 light green bag, 1 drab tomato bag, 4 clear purple bags.
+plaid salmon bags contain 3 posh gray bags, 1 dim beige bag, 1 plaid brown bag.
+faded gray bags contain 3 plaid fuchsia bags, 5 plaid magenta bags, 5 plaid white bags, 1 dull beige bag.
+posh aqua bags contain 2 mirrored turquoise bags.
+mirrored crimson bags contain no other bags.
+vibrant magenta bags contain 1 dull purple bag, 4 shiny red bags, 5 drab chartreuse bags, 4 bright red bags.
+striped yellow bags contain 1 shiny tan bag.
+vibrant orange bags contain 4 plaid silver bags, 5 dim teal bags, 1 striped maroon bag, 3 plaid red bags.
+dark indigo bags contain 3 drab purple bags.
+shiny gray bags contain 1 wavy yellow bag.
+faded plum bags contain no other bags.
+dim blue bags contain 2 dotted crimson bags, 5 muted chartreuse bags, 3 dark silver bags, 4 vibrant lime bags.
+muted white bags contain 4 muted teal bags, 3 posh purple bags, 1 dull lavender bag, 5 pale crimson bags.
+muted lime bags contain 1 shiny turquoise bag, 2 faded indigo bags, 2 vibrant silver bags, 1 pale turquoise bag.
+posh coral bags contain 5 faded violet bags.
+dotted fuchsia bags contain 1 clear tan bag, 1 striped lavender bag.
+wavy brown bags contain 2 dim aqua bags.
+posh brown bags contain 1 shiny cyan bag, 5 plaid orange bags, 3 light coral bags.
+drab purple bags contain 5 faded orange bags.
+muted tan bags contain 2 wavy teal bags, 3 dim salmon bags, 1 bright gold bag, 3 clear gray bags.
+dim yellow bags contain 1 vibrant gray bag, 4 vibrant lavender bags, 1 muted magenta bag.
+pale salmon bags contain 2 vibrant beige bags, 3 bright maroon bags.
+faded turquoise bags contain 4 plaid purple bags, 2 light tomato bags, 3 light salmon bags.
+clear teal bags contain 4 muted yellow bags, 3 dim beige bags, 5 faded tomato bags, 1 dim red bag.
+vibrant olive bags contain 3 muted lime bags, 5 shiny blue bags, 3 light gold bags, 3 dark olive bags.
+dim beige bags contain 1 light cyan bag, 3 faded plum bags.
+dull black bags contain 2 striped black bags, 5 wavy brown bags, 1 bright red bag, 1 drab teal bag.
+pale turquoise bags contain 5 vibrant violet bags, 3 dotted fuchsia bags, 2 striped blue bags, 4 posh purple bags.
+wavy red bags contain 3 drab teal bags.
+faded gold bags contain 5 dull lavender bags.
+faded black bags contain 5 wavy turquoise bags, 5 mirrored crimson bags.
+bright orange bags contain 2 striped maroon bags, 4 light cyan bags, 5 light silver bags, 5 wavy indigo bags.
+drab teal bags contain 4 wavy aqua bags, 5 light bronze bags, 1 drab red bag.
+dull salmon bags contain 4 dull orange bags.
+bright lavender bags contain 2 plaid silver bags, 3 bright crimson bags.
+drab cyan bags contain 2 bright bronze bags, 5 bright crimson bags, 2 wavy yellow bags.
+dull plum bags contain 3 shiny lavender bags, 2 bright magenta bags, 2 mirrored crimson bags, 4 mirrored silver bags.
+dotted teal bags contain 3 muted yellow bags, 3 dotted turquoise bags, 5 mirrored white bags.
+vibrant turquoise bags contain 5 clear magenta bags, 5 dark beige bags, 2 vibrant tan bags, 3 plaid blue bags.
+pale crimson bags contain 2 bright turquoise bags, 4 dark lime bags.
+pale plum bags contain 1 shiny chartreuse bag, 3 vibrant gold bags, 5 plaid violet bags, 5 dim salmon bags.
+mirrored lime bags contain 2 plaid green bags.
+pale lavender bags contain 5 dotted gold bags, 1 striped maroon bag, 3 shiny tan bags, 5 drab white bags.
+muted olive bags contain 3 drab crimson bags, 2 dotted gray bags, 5 dotted tomato bags, 3 posh bronze bags.
+drab brown bags contain 3 dull orange bags, 4 posh gold bags, 2 pale crimson bags, 1 plaid white bag.
+bright tan bags contain 1 dark white bag, 5 bright turquoise bags.
+faded indigo bags contain 3 pale yellow bags, 2 mirrored brown bags, 1 shiny gray bag, 5 bright turquoise bags.
+dark aqua bags contain 1 posh gray bag, 4 striped coral bags, 2 posh olive bags, 2 bright white bags.
+light tan bags contain 2 faded purple bags, 5 muted fuchsia bags.
+dark magenta bags contain 4 posh silver bags, 5 pale plum bags, 5 muted violet bags, 2 faded green bags.
+clear maroon bags contain 3 muted maroon bags, 1 clear olive bag, 2 faded black bags.
+posh purple bags contain 4 faded orange bags, 4 shiny salmon bags.
+bright gold bags contain 1 dull crimson bag, 1 shiny lavender bag.
+dull purple bags contain 3 clear silver bags, 1 drab aqua bag, 3 wavy beige bags.
+muted cyan bags contain 1 plaid green bag.
+vibrant yellow bags contain 3 faded plum bags, 4 vibrant lavender bags, 2 muted magenta bags.
+vibrant green bags contain 5 dim chartreuse bags, 2 posh lavender bags.
+plaid bronze bags contain 4 dim tomato bags, 3 shiny silver bags.
+striped blue bags contain 5 vibrant gold bags.
+plaid coral bags contain 4 faded purple bags, 3 drab turquoise bags, 1 light teal bag, 2 posh indigo bags.
+posh turquoise bags contain 5 posh cyan bags, 5 mirrored violet bags.
+faded crimson bags contain 2 plaid salmon bags, 1 striped magenta bag, 1 striped maroon bag.
+striped purple bags contain 1 drab violet bag, 2 pale maroon bags, 2 drab beige bags, 4 faded maroon bags.
+clear orange bags contain 5 dotted red bags, 4 mirrored red bags.
+striped fuchsia bags contain 2 bright tomato bags, 4 dull magenta bags.
+wavy purple bags contain 5 wavy olive bags, 3 shiny silver bags.
+dotted crimson bags contain 1 striped teal bag, 5 shiny tomato bags.
+dull lavender bags contain 1 dotted tomato bag, 3 wavy indigo bags, 1 faded silver bag.
+dotted magenta bags contain 3 dotted coral bags.
+drab silver bags contain 5 dark indigo bags, 4 bright bronze bags, 1 dim lime bag, 3 bright aqua bags.
+clear cyan bags contain 1 bright maroon bag.
+shiny beige bags contain 2 plaid beige bags, 2 striped magenta bags, 4 drab yellow bags, 4 muted yellow bags.
+dim turquoise bags contain 2 dull tan bags.
+drab coral bags contain 4 striped bronze bags, 3 dull orange bags, 5 plaid silver bags.
+light lavender bags contain 1 wavy plum bag, 4 posh purple bags.
+posh yellow bags contain 3 dark lime bags, 3 light cyan bags, 4 dull crimson bags.
+posh violet bags contain 2 faded chartreuse bags.
+shiny teal bags contain 5 mirrored salmon bags, 1 wavy plum bag, 3 posh purple bags, 2 posh cyan bags.
+vibrant lime bags contain 1 dotted tomato bag, 1 drab fuchsia bag, 1 mirrored brown bag.
+dark fuchsia bags contain 1 vibrant blue bag.
+bright green bags contain 4 dark purple bags, 4 bright tan bags, 5 drab turquoise bags.
+dull coral bags contain 2 dotted tomato bags.
+posh white bags contain 3 dull bronze bags, 1 faded salmon bag, 3 pale tomato bags, 3 vibrant salmon bags.
+plaid black bags contain 4 vibrant aqua bags, 2 shiny teal bags.
+posh lavender bags contain 4 wavy beige bags, 1 dim silver bag, 2 faded white bags.
+posh orange bags contain 4 dim orange bags, 3 faded chartreuse bags.
+plaid brown bags contain 5 shiny fuchsia bags, 5 striped magenta bags, 2 wavy coral bags, 1 vibrant beige bag.
+shiny plum bags contain 3 light green bags, 4 bright orange bags.
+dim aqua bags contain 4 faded gold bags, 1 dotted lavender bag, 3 light gold bags, 4 shiny aqua bags.
+wavy gold bags contain 4 clear violet bags, 5 dim red bags, 5 drab crimson bags, 2 dull coral bags.
+vibrant tomato bags contain 3 faded olive bags.
+bright silver bags contain 2 dull lavender bags, 4 faded aqua bags, 4 dim coral bags.
+wavy turquoise bags contain 4 dull lavender bags, 1 drab aqua bag.
+wavy aqua bags contain 3 wavy yellow bags.
+light indigo bags contain 5 dim beige bags, 3 drab fuchsia bags, 1 plaid violet bag, 5 bright yellow bags.
+striped red bags contain 3 bright violet bags, 5 dark indigo bags, 5 dim silver bags.
+posh lime bags contain 5 striped teal bags, 3 dark brown bags, 4 bright crimson bags, 2 posh violet bags.
+faded magenta bags contain 5 light gold bags, 1 posh indigo bag, 3 plaid lime bags.
+vibrant lavender bags contain 5 faded maroon bags, 3 striped orange bags, 3 dull crimson bags.
+clear purple bags contain 5 dark green bags, 3 light cyan bags, 3 clear white bags, 4 pale silver bags.
+muted purple bags contain 5 drab fuchsia bags, 1 vibrant salmon bag, 5 bright yellow bags.
+bright lime bags contain 5 vibrant violet bags, 5 wavy maroon bags.
+bright black bags contain 5 dark silver bags, 2 vibrant green bags.
+muted magenta bags contain no other bags.
+striped tomato bags contain 4 shiny gold bags.
+pale black bags contain 3 dull brown bags, 2 wavy coral bags, 2 posh purple bags, 4 faded beige bags.
+dim red bags contain 1 dotted tomato bag, 2 wavy beige bags.
+light black bags contain 4 dull maroon bags, 3 dotted aqua bags, 3 drab purple bags.
+shiny turquoise bags contain 3 dull blue bags, 4 posh bronze bags.
+pale indigo bags contain 4 dotted tomato bags.
+shiny white bags contain 5 vibrant tomato bags, 4 dotted magenta bags, 3 dull aqua bags.
+dark lavender bags contain 4 faded orange bags.
+shiny brown bags contain 3 bright orange bags, 2 dotted crimson bags, 2 wavy aqua bags.
+light chartreuse bags contain 1 muted lavender bag.
+faded aqua bags contain 4 dull green bags, 4 faded violet bags, 4 clear gray bags.
+light olive bags contain 4 shiny purple bags, 3 shiny plum bags.
+wavy indigo bags contain 3 dim green bags, 5 shiny lavender bags, 3 posh olive bags, 1 dull crimson bag.
+dull tomato bags contain 3 light coral bags, 2 light cyan bags, 3 plaid silver bags.
+clear turquoise bags contain 1 wavy crimson bag, 4 dim tomato bags.
+dim tomato bags contain 5 shiny lavender bags, 2 dim gold bags.
+wavy black bags contain 4 wavy chartreuse bags, 4 dull coral bags.
+dotted maroon bags contain 5 pale violet bags, 5 vibrant aqua bags, 5 plaid cyan bags.
+clear lavender bags contain 2 dotted turquoise bags, 4 light purple bags, 1 plaid plum bag.
+dotted cyan bags contain 2 dotted turquoise bags, 4 plaid gold bags, 5 drab red bags, 5 faded orange bags.
+muted violet bags contain 3 light teal bags, 2 striped gold bags.
+wavy silver bags contain 2 dim coral bags, 1 shiny chartreuse bag, 4 shiny turquoise bags.
+drab crimson bags contain 2 drab beige bags.
+dull aqua bags contain 4 striped maroon bags, 5 vibrant beige bags, 3 faded gold bags, 3 dark lime bags.
+vibrant coral bags contain 4 faded gold bags, 2 dotted black bags, 5 drab tomato bags.
+pale beige bags contain 1 dotted coral bag.
+dim olive bags contain 5 clear gray bags, 2 muted violet bags, 3 clear gold bags, 4 shiny red bags.
+dim cyan bags contain 4 plaid silver bags.
+muted bronze bags contain 4 wavy yellow bags, 1 vibrant yellow bag, 5 dim tomato bags, 2 mirrored silver bags.
+dim gold bags contain 2 dim green bags, 4 shiny tomato bags, 4 striped white bags, 4 mirrored crimson bags.
+vibrant gray bags contain 4 dotted turquoise bags, 4 posh violet bags.
+plaid orange bags contain 2 dotted turquoise bags.
+posh magenta bags contain 4 dotted lime bags.
+light silver bags contain 5 shiny gold bags, 3 dull tan bags.
+bright plum bags contain 5 pale magenta bags, 5 dull aqua bags.
+drab red bags contain 1 dim gold bag.
+striped salmon bags contain 1 vibrant lavender bag, 3 wavy crimson bags, 5 posh olive bags.
+dotted purple bags contain 3 dull lavender bags.
+bright violet bags contain 2 dotted indigo bags, 4 shiny violet bags.
+muted red bags contain 2 mirrored silver bags.
+dotted green bags contain 5 muted plum bags.
+clear lime bags contain no other bags.
+wavy gray bags contain 1 posh cyan bag, 5 dim bronze bags, 5 posh lime bags, 4 drab silver bags.
+dotted brown bags contain 4 striped tomato bags.
+plaid indigo bags contain 1 plaid purple bag, 3 dark turquoise bags, 3 light purple bags, 5 dotted cyan bags.
+mirrored olive bags contain 5 bright gold bags, 3 dotted gold bags, 4 drab gray bags, 4 drab tomato bags.
+wavy green bags contain 3 mirrored indigo bags, 4 wavy chartreuse bags, 2 clear cyan bags, 5 bright violet bags.
+light gray bags contain 4 vibrant yellow bags, 2 dull blue bags.
+posh plum bags contain 3 wavy yellow bags, 5 dim yellow bags, 2 clear chartreuse bags.
+posh bronze bags contain 2 clear lime bags.
+bright indigo bags contain 4 muted salmon bags, 2 posh violet bags.
+mirrored violet bags contain 1 faded plum bag, 3 dull orange bags.
+muted silver bags contain 3 mirrored indigo bags, 4 shiny fuchsia bags.
+striped coral bags contain 2 posh turquoise bags.
+plaid tomato bags contain 1 wavy beige bag, 5 muted green bags.
+dark gold bags contain 1 clear gold bag, 2 light maroon bags, 3 pale teal bags.
+light green bags contain 1 dull aqua bag, 4 dotted magenta bags, 4 dull purple bags.
+plaid lime bags contain 1 faded fuchsia bag.
+muted beige bags contain 1 dotted coral bag, 1 plaid fuchsia bag, 2 posh bronze bags.
+pale red bags contain 2 wavy gold bags, 1 striped lavender bag.
+striped lime bags contain 1 wavy turquoise bag, 4 dim aqua bags.
+muted black bags contain 3 dotted black bags.
+faded brown bags contain 1 dim turquoise bag, 2 plaid brown bags.
+plaid blue bags contain 2 muted salmon bags.
+muted indigo bags contain 2 dull fuchsia bags, 2 dull lime bags.
+dark coral bags contain 2 faded indigo bags, 3 shiny tomato bags, 2 mirrored salmon bags.
+vibrant beige bags contain 4 vibrant lavender bags.
+mirrored bronze bags contain 1 mirrored orange bag, 5 plaid red bags, 1 mirrored cyan bag.
+shiny red bags contain 1 bright yellow bag.
+light crimson bags contain 5 plaid crimson bags, 3 pale white bags, 3 drab fuchsia bags, 3 muted olive bags.
+drab blue bags contain 1 mirrored black bag, 3 striped fuchsia bags, 3 drab tan bags.
+striped violet bags contain 2 muted gray bags, 5 faded white bags, 5 striped black bags, 3 mirrored tomato bags.
+wavy maroon bags contain 2 light cyan bags, 3 muted teal bags, 2 vibrant lavender bags.
+pale brown bags contain 2 wavy black bags.
+bright aqua bags contain 3 plaid tan bags.
+muted plum bags contain 5 light bronze bags, 1 dotted beige bag, 3 vibrant cyan bags.
+posh green bags contain 4 faded lime bags, 1 dull coral bag, 4 mirrored silver bags.
+dark beige bags contain 3 wavy yellow bags, 5 dim salmon bags.
+light fuchsia bags contain 4 plaid coral bags.
+shiny tan bags contain 2 drab tan bags, 4 clear gray bags, 2 mirrored crimson bags, 1 vibrant beige bag.
+clear crimson bags contain 3 vibrant aqua bags, 4 dotted indigo bags.
+clear beige bags contain 4 posh olive bags, 4 bright lime bags, 3 dark green bags.
+dim gray bags contain 1 drab beige bag, 3 clear tomato bags, 2 mirrored fuchsia bags.
+light violet bags contain 3 plaid purple bags.
+faded silver bags contain 5 striped bronze bags, 4 dotted lavender bags.
+dotted white bags contain 5 drab green bags.
+shiny purple bags contain 3 posh turquoise bags, 2 dark brown bags.
+posh blue bags contain 2 vibrant chartreuse bags, 2 muted olive bags, 4 dull brown bags, 5 wavy magenta bags.
+striped cyan bags contain 1 pale plum bag, 3 dim maroon bags, 5 light salmon bags, 3 dim crimson bags.
+shiny tomato bags contain no other bags.
+plaid aqua bags contain 4 clear maroon bags, 4 plaid white bags, 2 posh chartreuse bags.
+pale magenta bags contain 5 muted teal bags, 1 vibrant lavender bag.
+dim plum bags contain 4 drab coral bags.
+drab beige bags contain 4 wavy crimson bags, 1 dull tan bag, 3 dotted tomato bags.
+wavy coral bags contain 1 mirrored yellow bag, 1 dull tan bag, 5 drab gold bags, 2 muted bronze bags.
+drab violet bags contain 4 faded maroon bags, 2 posh gold bags, 3 wavy maroon bags, 3 bright lime bags.
+light aqua bags contain 5 light bronze bags, 1 light tan bag, 1 dull beige bag.
+light orange bags contain 1 dark tan bag, 3 dim white bags, 3 plaid plum bags.
+pale chartreuse bags contain 3 pale violet bags, 1 drab fuchsia bag, 1 shiny indigo bag, 2 dull turquoise bags.
+faded chartreuse bags contain 4 vibrant lime bags, 3 drab tomato bags, 1 vibrant violet bag, 1 vibrant tomato bag.
+clear chartreuse bags contain 2 dotted plum bags, 1 muted brown bag, 2 wavy chartreuse bags, 4 faded green bags.
+dotted silver bags contain 3 mirrored yellow bags.
+dotted violet bags contain 4 muted turquoise bags, 4 light black bags.
+wavy orange bags contain 3 shiny fuchsia bags, 4 clear beige bags.
+dark red bags contain 1 faded salmon bag, 3 muted purple bags.
+dim bronze bags contain 2 clear turquoise bags.
+light turquoise bags contain 5 dark red bags.
+muted green bags contain 5 bright turquoise bags, 2 wavy coral bags, 3 faded chartreuse bags.
+vibrant violet bags contain 3 wavy indigo bags, 1 dotted gray bag, 4 vibrant beige bags.
+dull cyan bags contain 3 light maroon bags, 2 posh plum bags.
+muted aqua bags contain 2 dotted beige bags, 2 faded yellow bags, 3 plaid gray bags, 3 bright chartreuse bags.
+dark tomato bags contain 2 striped purple bags, 2 dark maroon bags, 2 dim silver bags.
+vibrant blue bags contain 4 dull orange bags.
+faded violet bags contain 2 vibrant lavender bags, 5 plaid plum bags, 4 bright magenta bags, 4 faded silver bags.
+bright salmon bags contain 1 dull crimson bag, 2 light maroon bags.
+vibrant aqua bags contain 4 dotted aqua bags, 3 vibrant gray bags, 3 dotted lavender bags.
+striped plum bags contain 2 mirrored lime bags, 2 dark salmon bags.
+plaid gold bags contain 4 dark lime bags, 3 drab aqua bags, 3 dim white bags, 2 mirrored brown bags.
\ No newline at end of file
diff --git a/2020/07/puzzle-1.py b/2020/07/puzzle-1.py
new file mode 100755
index 0000000..da054b8
--- /dev/null
+++ b/2020/07/puzzle-1.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+
+bdict: dict[str, list[str]] = {}
+
+# Recursively check if a bag can hold a shiny gold bag
+def holds_bag(innerbags: list[str]) -> bool:
+	if "no other" in innerbags:
+		return False
+	elif "shiny gold" in innerbags:
+		return True
+
+	for subbag in innerbags:
+		if holds_bag(bdict[subbag]):
+			return True
+
+
+def main() -> None:
+	global bdict
+	with open("input", "r") as f:
+		lines = f.readlines()
+
+	for baginfo in lines:
+		data = baginfo.split(" bags contain")
+
+		# { bag_name: [contained_bag_1, containted_bag_2, ...] }
+		bdict[data[0]] = [" ".join(b.split(" ")[-3:][:2]) for b in data[1].split(",")]
+
+	count = 0
+	for bag in bdict:
+		if holds_bag(bdict[bag]):
+			count += 1
+
+	print(count)
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/07/puzzle-2.py b/2020/07/puzzle-2.py
new file mode 100755
index 0000000..c87ea13
--- /dev/null
+++ b/2020/07/puzzle-2.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+
+
+bdict: dict[str, list[str]] = {}
+
+# Recursively find the number of sub-bags in a bag
+def total_bags(innerbags: list[dict[int, str]]) -> int:
+	if innerbags[0]["name"] == "no other":
+		return 0
+
+	return sum([bag["count"] + bag["count"] * total_bags(bdict[bag["name"]]) for bag in innerbags])
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		lines = f.readlines()
+
+	for baginfo in lines:
+		data = baginfo.split(" bags contain")
+
+		# { bag_name: [{ count: n, name: bag_name_ }, ...] }
+		bdict[data[0]] = []
+		for b in data[1].split(","):
+			bdict[data[0]].append(
+				{
+					"count": int(b.replace("no", "0").split(" ")[1]),
+					"name": " ".join(b.split(" ")[-3:][:2]),
+				}
+			)
+
+	print(total_bags(bdict["shiny gold"]))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/08/.gitignore b/2020/08/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/08/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/08/Makefile b/2020/08/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/08/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/08/input b/2020/08/input
new file mode 100644
index 0000000..49eb92d
--- /dev/null
+++ b/2020/08/input
@@ -0,0 +1,653 @@
+acc +9
+acc -2
+acc -12
+acc +33
+jmp +301
+nop +508
+jmp +216
+acc +27
+acc +35
+acc +43
+acc +31
+jmp +309
+acc +18
+acc -19
+acc +7
+jmp +44
+acc -13
+acc -17
+acc +31
+jmp +311
+nop +612
+jmp +143
+acc +22
+nop +85
+jmp +458
+acc -3
+jmp +13
+acc -19
+acc +27
+acc +12
+jmp +483
+acc +40
+acc +6
+jmp +128
+jmp +10
+acc +0
+acc -3
+acc -2
+jmp -11
+acc +43
+acc -12
+jmp +158
+acc +0
+jmp +240
+jmp +1
+acc +5
+acc +15
+jmp +187
+nop +563
+jmp +51
+acc -16
+jmp +158
+jmp +322
+acc +47
+nop -1
+jmp +299
+acc +26
+acc +25
+jmp +232
+jmp -9
+acc +15
+jmp +54
+jmp +558
+acc +7
+acc -7
+jmp +399
+nop +447
+jmp +71
+acc +26
+acc +46
+jmp +145
+acc +38
+acc +30
+acc +21
+jmp +263
+acc +10
+jmp +168
+acc +22
+nop +561
+jmp -26
+jmp +1
+acc -7
+jmp -5
+acc +28
+acc -6
+jmp +370
+jmp +94
+acc +50
+acc +42
+acc -9
+acc +30
+jmp +70
+acc +29
+jmp +166
+acc -5
+acc -18
+nop +84
+acc +2
+jmp +366
+jmp -40
+acc -4
+acc -15
+acc -1
+jmp +169
+jmp +1
+acc -4
+acc +0
+jmp -45
+nop -21
+nop +241
+acc -18
+acc +19
+jmp +26
+nop -51
+jmp +260
+acc +17
+jmp +428
+acc +6
+jmp +405
+acc +22
+acc +10
+nop +471
+jmp +352
+acc -6
+acc +48
+acc +7
+acc +3
+jmp +57
+acc -10
+acc +16
+acc +16
+acc +43
+jmp +432
+acc -5
+acc +0
+nop +339
+acc +49
+jmp +17
+acc +33
+nop +166
+acc -5
+jmp +392
+nop +246
+acc -7
+acc +21
+acc +30
+jmp +398
+acc +36
+acc +24
+acc -15
+acc -9
+jmp +114
+acc +19
+jmp +11
+acc +43
+nop +182
+jmp -129
+nop -29
+acc -6
+acc +2
+jmp +398
+jmp +78
+acc +36
+jmp +393
+acc +15
+nop -11
+acc -7
+acc -9
+jmp +76
+acc +0
+acc +27
+jmp +25
+acc +27
+nop -54
+jmp +458
+acc +3
+acc +29
+acc -4
+acc +43
+jmp +413
+acc +33
+acc +13
+jmp +382
+jmp -83
+acc +42
+acc +24
+jmp +64
+acc +23
+acc -13
+nop +110
+acc -5
+jmp +114
+jmp +113
+nop +112
+acc +26
+jmp -133
+jmp -12
+jmp +1
+jmp +330
+acc +25
+acc -1
+acc +30
+acc +42
+jmp -187
+jmp +1
+acc +20
+acc +35
+acc +36
+jmp -125
+jmp +165
+acc +28
+acc -17
+acc -12
+jmp +1
+jmp -120
+nop +1
+acc +2
+acc +26
+jmp +398
+acc +20
+acc -1
+jmp -127
+acc +36
+acc +14
+jmp +1
+jmp +331
+acc +50
+acc +1
+acc -10
+nop +159
+jmp -83
+jmp +374
+acc +17
+jmp +372
+acc +44
+nop -39
+jmp +228
+acc +17
+jmp +74
+acc +16
+acc +33
+acc -2
+jmp +152
+jmp +29
+acc +8
+acc +27
+nop +59
+jmp -32
+acc +28
+jmp -227
+nop -35
+jmp -168
+acc +13
+nop +390
+jmp -204
+acc +16
+acc +44
+jmp -230
+jmp +25
+acc +30
+jmp +383
+acc -11
+acc +38
+acc +11
+jmp +341
+acc +35
+acc +46
+acc -1
+jmp +94
+acc -4
+acc +12
+jmp +111
+jmp +133
+nop +283
+acc +13
+acc +37
+jmp +74
+nop -218
+jmp -178
+acc +46
+acc +25
+acc -5
+jmp -174
+acc +28
+acc +39
+acc +36
+acc +22
+jmp -172
+acc +19
+jmp -250
+nop +62
+acc +44
+nop +347
+acc +40
+jmp +345
+acc -3
+acc -13
+acc -11
+jmp +56
+jmp -180
+acc +17
+acc -4
+acc +46
+nop -165
+jmp +321
+acc -4
+jmp +1
+acc +9
+acc -12
+jmp -155
+acc +5
+jmp -96
+acc +0
+acc -2
+acc +38
+jmp +67
+acc -4
+nop -283
+acc +28
+jmp +324
+acc -9
+acc +43
+acc -1
+acc +9
+jmp -290
+acc +3
+acc +22
+nop +84
+acc -17
+jmp -210
+acc +7
+jmp -260
+nop -232
+nop +87
+acc +43
+acc +36
+jmp +96
+jmp +238
+acc +13
+acc -14
+acc +32
+acc +11
+jmp -146
+acc +13
+acc +37
+acc -10
+jmp +187
+acc +49
+acc +15
+jmp -234
+jmp -328
+jmp -136
+jmp +143
+jmp +1
+acc +27
+acc +22
+jmp +1
+jmp -5
+acc +30
+nop -7
+acc -6
+jmp -71
+acc -17
+acc +15
+jmp -52
+jmp -126
+acc -4
+jmp +151
+jmp +52
+nop -86
+acc +25
+jmp +187
+nop -22
+jmp -219
+acc +33
+nop -120
+acc +0
+jmp +215
+acc +46
+acc +38
+jmp +1
+jmp -262
+jmp +157
+acc -15
+acc +48
+acc +39
+acc +10
+jmp -137
+acc +47
+acc +50
+jmp -324
+nop +214
+acc +39
+jmp -178
+acc +49
+acc -10
+jmp -268
+jmp +50
+acc -14
+nop -100
+jmp +20
+acc +45
+acc -12
+acc -4
+jmp -208
+acc -19
+jmp -340
+acc +36
+nop -358
+acc +5
+jmp -348
+acc +47
+nop -18
+acc -12
+jmp -131
+acc +19
+acc +10
+acc +19
+acc +31
+jmp -164
+nop +162
+nop -260
+jmp +146
+acc +32
+acc -1
+nop -14
+jmp -192
+acc +3
+acc +31
+nop -185
+jmp -208
+jmp -69
+acc +43
+acc +43
+jmp -68
+acc -16
+acc +5
+acc -9
+jmp +126
+acc +33
+acc +2
+acc +34
+acc -9
+jmp -16
+acc +34
+acc -19
+jmp -266
+nop +135
+nop -389
+acc +33
+jmp -195
+acc +48
+jmp +1
+acc -12
+jmp +143
+nop -317
+acc -14
+nop -127
+acc +32
+jmp -372
+acc +24
+nop -41
+nop -42
+jmp -344
+acc +23
+nop +117
+nop +92
+acc +42
+jmp +143
+acc +48
+acc -6
+nop -272
+acc -13
+jmp -379
+acc -2
+acc +44
+acc +9
+jmp -369
+acc +6
+acc +25
+acc +34
+jmp -301
+nop -227
+acc +43
+jmp -141
+acc +12
+acc +41
+acc +17
+acc -11
+jmp +29
+jmp -121
+acc +6
+acc +7
+acc +7
+jmp +131
+nop +144
+nop -142
+acc -13
+acc -18
+jmp +149
+acc +14
+acc +49
+acc +25
+acc -17
+jmp -9
+acc +26
+acc -4
+jmp -230
+acc -18
+acc +36
+acc +27
+nop -142
+jmp +21
+acc +34
+nop +54
+jmp -476
+acc +10
+jmp -174
+nop -354
+acc +1
+jmp -324
+acc +40
+jmp +94
+acc -12
+jmp -136
+nop -454
+acc -14
+jmp +116
+acc +12
+acc -1
+nop -453
+jmp -241
+jmp -479
+acc -19
+jmp -87
+acc +27
+acc +48
+acc +0
+jmp -476
+acc +16
+acc +46
+jmp -534
+acc +0
+jmp -344
+acc +0
+acc +28
+jmp +10
+jmp -248
+nop -186
+jmp +1
+acc +26
+jmp -153
+acc +14
+acc -8
+nop -416
+jmp -91
+jmp -409
+jmp -326
+acc +2
+acc +8
+acc -18
+acc +33
+jmp -468
+jmp -175
+acc -7
+acc +45
+jmp -18
+jmp -375
+acc -8
+jmp +28
+acc -16
+nop -38
+acc +37
+acc +48
+jmp -343
+acc +10
+acc +26
+acc -9
+acc -16
+jmp -348
+acc +37
+jmp -453
+acc -2
+acc +27
+acc +17
+acc +28
+jmp -406
+acc +25
+acc +24
+acc +44
+acc +44
+jmp -532
+acc +10
+jmp -531
+acc +39
+acc +40
+jmp -284
+acc +19
+acc +3
+nop -533
+acc -3
+jmp -162
+nop -438
+acc -5
+jmp -114
+acc +45
+acc +1
+acc +28
+acc +9
+jmp -550
+jmp -222
+jmp -106
+acc -7
+nop -263
+nop -375
+jmp -381
+acc -4
+nop -223
+jmp -171
+jmp -465
+acc -2
+nop -562
+jmp -190
+acc +40
+jmp -4
+acc +30
+acc +21
+jmp -435
+acc +1
+acc +10
+jmp +1
+jmp -157
+acc -7
+acc +18
+acc -3
+acc +24
+jmp -113
+acc +21
+jmp -339
+acc +34
+jmp -563
+acc +27
+jmp -589
+jmp -61
+acc +35
+acc +50
+acc +8
+jmp -553
+acc +48
+acc -15
+acc +29
+acc +24
+jmp +1
\ No newline at end of file
diff --git a/2020/08/puzzles.c b/2020/08/puzzles.c
new file mode 100644
index 0000000..cfa9389
--- /dev/null
+++ b/2020/08/puzzles.c
@@ -0,0 +1,112 @@
+#include <err.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LINECOUNT 653
+
+struct Inst {
+	char opp;
+	int val;
+};
+
+/* Check if the given instruction has been executed already */
+static bool
+repeati(int const * const lines, int const rip)
+{
+	for (int i = 0; i < LINECOUNT; i++) {
+		if (lines[i] == rip)
+			return true;
+	}
+	return false;
+}
+
+static int
+run_circuit(struct Inst *circuit)
+{
+	int i, acc, rip;
+	int lines[LINECOUNT] = {0};
+
+	i = acc = rip = 0;
+
+	/* Execute the circuit */
+	do {
+		lines[i++] = rip;
+		switch (circuit[rip].opp) {
+		case 'j':
+			rip += circuit[rip].val;
+			if (rip >= LINECOUNT)
+				return acc;
+			break;
+		case 'a':
+			acc += circuit[rip].val;
+			/* FALLTHROUGH */
+		case 'n':
+			rip++;
+			break;
+		}
+	} while (!repeati(lines, rip));
+
+#ifdef PART2
+	return -1;
+#else
+	return acc;
+#endif
+}
+
+int
+main(void)
+{
+	int i = 0;
+	char cl[10];
+	FILE *fp;
+	struct Inst circuit[LINECOUNT];
+
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	/* Load the entire circuit */
+	while (fgets(cl, sizeof(cl), fp)) {
+		char *val;
+		/* struct Inst operation; */
+
+		val = strtok(cl, " ");
+		circuit[i++] = (struct Inst) {
+			.opp = cl[0],
+			.val = atoi(strtok(NULL, " "))
+		};
+	}
+	fclose(fp);
+
+	int result = -1;
+#ifdef PART2
+	int count, prev_count;
+	count = prev_count = 1;
+
+	/* Run circuit until it completes successfully */
+	while (result == -1 && count < LINECOUNT) {
+		for (i = 0; i < LINECOUNT; i++) {
+			if (circuit[i].opp == 'j' || circuit[i].opp == 'n')
+				count--;
+
+			/* Swap jmp and nop */
+			if (!count) {
+				circuit[i].opp = (circuit[i].opp == 'j') ? 'n' : 'j';
+				break;
+			}
+		}
+
+		count = ++prev_count;
+		result = run_circuit(circuit);
+
+		/* Return to original array */
+		circuit[i].opp = (circuit[i].opp == 'j') ? 'n' : 'j';
+	}
+#else
+	result = run_circuit(circuit);
+#endif
+
+	printf("%d\n", result);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/09/input b/2020/09/input
new file mode 100644
index 0000000..b6fbe43
--- /dev/null
+++ b/2020/09/input
@@ -0,0 +1,1000 @@
+42
+27
+23
+19
+4
+26
+31
+29
+11
+49
+38
+9
+45
+1
+40
+46
+39
+28
+44
+16
+13
+5
+32
+17
+50
+12
+20
+6
+7
+10
+22
+14
+18
+60
+59
+8
+19
+9
+11
+15
+21
+23
+39
+24
+25
+16
+26
+13
+29
+17
+27
+28
+20
+35
+30
+31
+22
+32
+44
+33
+38
+47
+34
+36
+37
+41
+55
+64
+40
+42
+43
+46
+39
+45
+61
+48
+50
+52
+65
+62
+53
+67
+72
+69
+70
+74
+73
+98
+86
+76
+79
+81
+108
+84
+82
+91
+160
+153
+93
+253
+100
+102
+105
+115
+175
+166
+151
+149
+142
+218
+147
+152
+162
+155
+161
+163
+165
+173
+255
+184
+191
+193
+293
+195
+357
+252
+295
+220
+257
+404
+289
+291
+322
+294
+314
+415
+343
+316
+318
+324
+328
+512
+364
+517
+379
+384
+511
+636
+615
+574
+472
+477
+509
+644
+1021
+605
+585
+608
+610
+800
+634
+640
+1122
+642
+1255
+692
+841
+893
+981
+763
+1313
+1586
+1046
+949
+986
+1057
+1062
+1094
+1444
+1300
+2393
+1193
+1250
+1244
+1274
+1475
+1282
+1405
+1334
+1533
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+1604
+1744
+2467
+1712
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+2043
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+26306842
+20695591
+19828210
+20394650
+21641228
+21974270
+39754393
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diff --git a/2020/09/puzzle-1.py b/2020/09/puzzle-1.py
new file mode 100755
index 0000000..f68fc21
--- /dev/null
+++ b/2020/09/puzzle-1.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+from typing import List
+
+
+def is_valid(nums: List[int], lp: int, up: int) -> bool:
+	for i in range(lp, up):
+		x = nums[up] - nums[i]
+		if x in nums[lp:up] and x != nums[i]:
+			return True
+	return False
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		nums = list(map(int, f.readlines()))
+
+	lp = 0
+	up = 25
+
+	while is_valid(nums, lp, up):
+		lp += 1
+		up += 1
+
+	print(nums[up])
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/09/puzzle-2.py b/2020/09/puzzle-2.py
new file mode 100755
index 0000000..8833f50
--- /dev/null
+++ b/2020/09/puzzle-2.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+import numpy as np
+
+
+def main() -> None:
+	goal = 138879426
+	with open("input", "r") as f:
+		nums = np.array(list(map(int, f.readlines())), dtype=int)
+
+	lp = 0
+	up = 1
+
+	while (x := sum(nums[lp : up + 1])) != goal:
+		if x > goal:
+			up -= 1
+			lp += 1
+		elif x < goal:
+			up += 1
+
+	sorted = np.sort(nums[lp : up + 1])
+	print(sorted[0] + sorted[-1])
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/10/input b/2020/10/input
new file mode 100644
index 0000000..379b145
--- /dev/null
+++ b/2020/10/input
@@ -0,0 +1,108 @@
+147
+174
+118
+103
+67
+33
+96
+28
+43
+22
+16
+138
+75
+148
+35
+6
+10
+169
+129
+115
+21
+52
+58
+79
+46
+7
+139
+104
+91
+51
+172
+57
+49
+126
+95
+149
+125
+123
+112
+30
+78
+44
+37
+167
+157
+29
+173
+98
+36
+63
+111
+160
+18
+8
+9
+159
+179
+72
+110
+2
+53
+150
+17
+81
+97
+108
+102
+56
+135
+166
+168
+163
+1
+25
+3
+158
+101
+132
+144
+45
+140
+34
+156
+178
+105
+68
+153
+80
+82
+59
+50
+122
+69
+85
+109
+40
+124
+119
+94
+88
+13
+180
+177
+133
+66
+134
+60
+141
diff --git a/2020/10/puzzle-1.sh b/2020/10/puzzle-1.sh
new file mode 100755
index 0000000..f31af02
--- /dev/null
+++ b/2020/10/puzzle-1.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+sort -n input | awk '
+BEGIN  { o = t = 1 }
+NR > 1 { if ($0 - prev == 1) o++; else if ($0 - prev == 3) t++; }
+       { prev = $0 }
+END    { print o * t }'
diff --git a/2020/10/puzzle-2.py b/2020/10/puzzle-2.py
new file mode 100755
index 0000000..bdf7bbf
--- /dev/null
+++ b/2020/10/puzzle-2.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+from typing import List
+
+adaptors: list[str]
+
+
+def combos(i: int, counts: dict[int, dict[int, int]] = {}) -> int:
+	if i == len(adaptors) - 1:
+		return 1
+	if i in counts:
+		return counts[i]
+
+	ans = 0
+	for j in range(i + 1, len(adaptors)):
+		if adaptors[j] - adaptors[i] <= 3:
+			ans += combos(j, counts)
+
+	counts[i] = ans
+	return ans
+
+
+def main() -> None:
+	global adaptors
+	with open("input", "r") as f:
+		adaptors = list(map(int, f.readlines()))
+
+	adaptors.append(0)
+	adaptors.sort()
+	adaptors.append(max(adaptors) + 3)
+
+	print(combos(0))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/11/.gitignore b/2020/11/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/11/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/11/Makefile b/2020/11/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/11/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/11/input b/2020/11/input
new file mode 100644
index 0000000..a586f62
--- /dev/null
+++ b/2020/11/input
@@ -0,0 +1,98 @@
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+LLLLLL.LLLLLL.LLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLL.LL.LLLLLLLL.LLLLLL.LLLLLLLLLL.LLLLLLLLL
+.LLLLL.LLLLLL.LLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLL.LLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLL.LLLL.LLLL
+LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLL..LLLLLLLL.LLLLLLLL.LLLLLLLL.L.LLLLLLL
+LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLL.LLLLL.LL.LLLLLLLLLLLLLLLLLL
+LLLLLL.LLLLLL.LLLLL.LLLL.LL.LLLLL.LLLLL.LLLLLLLL..LLL.LLLLL.L.LLLLLLLLLLLLLLLLL.LLL.LLLL.LLLLLLLLL
+LL.LLL.LLLLLL.LLLLL.LLLLLLLLLLLLL.LL.LLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLL.L.LL.LLLLLLLLLLL.LLLLLL
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+.LLLLL..L.L.L...L...L..LL.L.L.LL.L...L.L.L...................LL..L...L......L..L.........L.....LL.
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+LLLLLL.LLLLLL.LLLLLL.L.LLLL.LLLLL.LLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLL.LL..LLLL.
+.LLLLL.LLLLLLLLLLLL.LLLL.LLLLLLLL.LLLLLLLLLLLLLL.L.LLLL.LLLLLLLLLLLLLL.LLLLLLL..LLLLLLLL.LLLLLLLLL
+LLLLLL.LLLLLL.LLLLL.LLLLLLL.LLLL...LLLLL.LLLLLLL.LLLL.LLLLLL..LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
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+LLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLLLL.LLLLLLLL.LL.LLLLLLLLLLLLLL.
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+L.LL.L.L...L.LL.L.LLL...L.......LLL.L.LL..LLLL.L.L...L..LL.L..LL..L.L..LLLL.L.L..L.L....L....L...L
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+LLLLLL.LLLLLL..LLLL.LLLLLLLLLLLLLLLL.LL.LLLL.LLL.LLLL.LLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL
+LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLL.L.L.LLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLL
+LLLLLL.LLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LL.LLLLLLLLL.LLLLLLL.LLLLLL
+L..L.LL......LLL....LLLL.......L.L..L..L....LLLLL..LLLLL..L..L.L.L........LLL...LL.L......LLL.....
+LLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLL..LLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LL.LLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL
+LLLLLL.LLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL
+LLLLL.LLLL.LLLLLLLL..LLLLLL.LLLLL.LLLL...LLLLL.L.LLLL.LLLLLLL..LLLLLLLL.LLLLLLLLLLLLLLLL.LLLLLLLLL
+LLLLLLLLLLLLL.LLLLL.LLLLLLL.LLLLL.LLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLL.LLLLL.LLL
+LLLLLLLLLLLLL.LLLLL.L.LLLLL.LLLLLLLLLLL.LLLLLLLLLL.LL.LLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLLLLLLLLL.LLLL
+LLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL
+LLLLLL.LLLLLL.LLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLL.LLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLL.LLLLLLLLL
+LLLLLL.LLLLLL.LLLLL.LLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLL.L.LLLLLL.LLLLLLLLLLLLLLLLL.
+LLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL
\ No newline at end of file
diff --git a/2020/11/puzzles.c b/2020/11/puzzles.c
new file mode 100644
index 0000000..7c579b9
--- /dev/null
+++ b/2020/11/puzzles.c
@@ -0,0 +1,158 @@
+#include <err.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define ROWCNT 98
+#define ROWLEN 98
+
+#ifdef PART2
+	#define IS_SEAT(a, b)                                                                              \
+		if (rows[a][b] == '.')                                                             \
+		continue
+	#define IS_OCC(a, b)                                                                               \
+		if (rows[a][b] == '#')                                                             \
+		adjecent++
+#endif
+
+bool changed;
+char rows[ROWCNT][ROWLEN + 1];
+char temp[ROWCNT][ROWLEN + 1];
+
+/* Check and update a seat at the given index */
+static void
+check_seat(int const i, int const j)
+{
+	if (rows[i][j] == '.')
+		return;
+
+	int adjecent = 0;
+
+#ifdef PART2
+	/* Up */
+	for (int h = i - 1; h >= 0; h--) {
+		IS_SEAT(h, j);
+		IS_OCC(h, j);
+		break;
+	}
+	/* Down */
+	for (int h = i + 1; h < ROWCNT; h++) {
+		IS_SEAT(h, j);
+		IS_OCC(h, j);
+		break;
+	}
+	/* Left */
+	for (int h = j - 1; h >= 0; h--) {
+		IS_SEAT(i, h);
+		IS_OCC(i, h);
+		break;
+	}
+	/* Right */
+	for (int h = j + 1; h < ROWLEN; h++) {
+		IS_SEAT(i, h);
+		IS_OCC(i, h);
+		break;
+	}
+	/* Up-Left */
+	for (int h = i - 1, k = j - 1; h >= 0 && k >= 0; h--, k--) {
+		IS_SEAT(h, k);
+		IS_OCC(h, k);
+		break;
+	}
+	/* Up-Right */
+	for (int h = i - 1, k = j + 1; h >= 0 && k < ROWLEN; h--, k++) {
+		IS_SEAT(h, k);
+		IS_OCC(h, k);
+		break;
+	}
+	/* Down-Left */
+	for (int h = i + 1, k = j - 1; h < ROWCNT && k >= 0; h++, k--) {
+		IS_SEAT(h, k);
+		IS_OCC(h, k);
+		break;
+	}
+	/* Down-Right */
+	for (int h = i + 1, k = j + 1; h < ROWCNT && k < ROWLEN; h++, k++) {
+		IS_SEAT(h, k);
+		IS_OCC(h, k);
+		break;
+	}
+#else
+	for (int h = i - 1; h <= i + 1; h++) {
+		if (h < 0 || h > ROWCNT - 1)
+			continue;
+		for (int k = j - 1; k <= j + 1; k++) {
+			if (k < 0 || k > ROWCNT - 1 || (h == i && k == j))
+				continue;
+			if (rows[h][k] == '#')
+				adjecent++;
+		}
+	}
+#endif
+	/* Edit seats as needed */
+	if (rows[i][j] == 'L' && adjecent == 0) {
+		temp[i][j] = '#';
+		changed = true;
+#ifdef PART2
+	} else if (rows[i][j] == '#' && adjecent >= 5) {
+#else
+	} else if (rows[i][j] == '#' && adjecent >= 4) {
+#endif
+		temp[i][j] = 'L';
+		changed = true;
+	} else
+		temp[i][j] = rows[i][j];
+}
+
+int
+main(void)
+{
+	/* Initialize the temp array to be all floor */
+	int i, j;
+	for (i = 0; i < ROWCNT; i++) {
+		for (j = 0; j < ROWLEN; j++)
+			temp[i][j] = '.';
+	}
+
+	FILE *fp;
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	/* Read in seats */
+	i = j = 0;
+	char c;
+	while ((c = fgetc(fp)) != EOF) {
+		if (c == '\n') {
+			i = 0;
+			j++;
+		} else
+			rows[j][i++] = c;
+	}
+	fclose(fp);
+
+	/* Update the seats until they don't change anymore */
+	do {
+		changed = false;
+		for (i = 0; i < ROWCNT; i++) {
+			for (j = 0; j < ROWLEN; j++)
+				check_seat(i, j);
+		}
+
+		for (i = 0; i < ROWCNT; i++) {
+			for (j = 0; j < ROWLEN; j++)
+				rows[i][j] = temp[i][j];
+		}
+	} while (changed);
+
+	/* Calculate filled seats */
+	int count = 0;
+	for (i = 0; i < ROWCNT; i++) {
+		for (j = 0; j < ROWLEN; j++) {
+			if (rows[i][j] == '#')
+				count++;
+		}
+	}
+
+	printf("%d\n", count);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/12/.gitignore b/2020/12/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/12/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/12/Makefile b/2020/12/Makefile
new file mode 100644
index 0000000..cf466dc
--- /dev/null
+++ b/2020/12/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzle-1.c
+	${CC} ${CFLAGS} -o puzzle-2 puzzle-2.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/12/input b/2020/12/input
new file mode 100644
index 0000000..5e5e7be
--- /dev/null
+++ b/2020/12/input
@@ -0,0 +1,778 @@
+R90
+N2
+N2
+F94
+R90
+E3
+F2
+L90
+L90
+F66
+S5
+L90
+W3
+R90
+N3
+W2
+N2
+W1
+R90
+E3
+F100
+S4
+F66
+R180
+F96
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+N2
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+S3
+E1
+F65
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+F6
+L180
+W2
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+E2
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+F23
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+F72
+N5
+W2
+N5
+F47
+L270
+F18
+W1
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+F91
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+W5
+N2
+F60
+E5
+S3
+R90
+R180
+S3
+L90
+W4
+F80
+S2
+L90
+F31
+W1
+L90
+F45
+S3
+F64
+N1
+W4
+N2
+R180
+W3
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+S1
+F7
+W1
+R180
+W1
+S4
+E4
+W4
+F87
+R90
+N5
+F65
+W4
+F15
+E5
+N5
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+F36
+E1
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+E1
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+F42
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+E4
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+F35
+N4
+E4
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+F61
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+S2
+F30
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+F31
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+F100
+N1
+F3
+W3
+F46
+R90
+E2
+F62
+L180
+F90
+L180
+S3
+L90
+S5
+F40
+N4
+F95
\ No newline at end of file
diff --git a/2020/12/puzzle-1.c b/2020/12/puzzle-1.c
new file mode 100644
index 0000000..1a4c7ab
--- /dev/null
+++ b/2020/12/puzzle-1.c
@@ -0,0 +1,73 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+main(void)
+{
+	FILE *fp;
+	char cl[5];
+	int north, east;
+	int direction = 0;
+
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	north = east = 0;
+	while (fgets(cl, sizeof(cl), fp) != NULL) {
+		switch (cl[0]) {
+		case 'N':
+			north += atoi(&cl[1]);
+			break;
+		case 'E':
+			east += atoi(&cl[1]);
+			break;
+		case 'S':
+			north -= atoi(&cl[1]);
+			break;
+		case 'W':
+			east -= atoi(&cl[1]);
+			break;
+		case 'L':
+			direction -= atoi(&cl[1]);
+			goto wrap;
+		case 'R':
+			direction += atoi(&cl[1]);
+
+wrap:
+			/* 0 <= direction < 360 */
+			if (direction >= 360)
+				direction -= 360;
+			else if (direction < 0)
+				direction += 360;
+			break;
+		case 'F':
+			switch (direction) {
+			case 0:
+				east += atoi(&cl[1]);
+				break;
+			case 90:
+				north -= atoi(&cl[1]);
+				break;
+			case 180:
+				east -= atoi(&cl[1]);
+				break;
+			case 270:
+				north += atoi(&cl[1]);
+				break;
+			}
+			break;
+		}
+	}
+	fclose(fp);
+
+	/* Absolute value */
+	if (north < 0)
+		north = -north;
+	if (east < 0)
+		east = -east;
+
+	printf("%d\n", north + east);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/12/puzzle-2.c b/2020/12/puzzle-2.c
new file mode 100644
index 0000000..8ac34b4
--- /dev/null
+++ b/2020/12/puzzle-2.c
@@ -0,0 +1,79 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct coords {
+	int north;
+	int east;
+};
+
+int
+main(void)
+{
+	FILE *fp;
+	char cl[6];
+	struct coords waypoint = {1, 10};
+	struct coords ship = {0, 0};
+
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	while (fgets(cl, sizeof(cl), fp) != NULL) {
+		switch (cl[0]) {
+		case 'N':
+			waypoint.north += atoi(&cl[1]);
+			break;
+		case 'E':
+			waypoint.east += atoi(&cl[1]);
+			break;
+		case 'S':
+			waypoint.north -= atoi(&cl[1]);
+			break;
+		case 'W':
+			waypoint.east -= atoi(&cl[1]);
+			break;
+		case 'F':;
+			unsigned int const val = atoi(&cl[1]);
+			ship.north += val * waypoint.north;
+			ship.east += val * waypoint.east;
+			break;
+		/* Left and right */
+		default:;
+			int direction = atoi(&cl[1]);
+
+			/* (x, y) -> (-x, -y) */
+			if (direction == 180) {
+				waypoint.north = -waypoint.north;
+				waypoint.east = -waypoint.east;
+				break;
+			}
+
+			/* 0 <= direction < 360 */
+			if (cl[0] == 'R')
+				direction = -direction + 360;
+
+			int const temp = waypoint.east;
+			if (direction == 90) {
+				/* (x, y) -> (-y, x) */
+				waypoint.east = -waypoint.north;
+				waypoint.north = temp;
+			} else {
+				/* (x, y) -> (y, -x) */
+				waypoint.east = waypoint.north;
+				waypoint.north = -temp;
+			}
+			break;
+		}
+	}
+	fclose(fp);
+
+	/* Absolute value */
+	if (ship.north < 0)
+		ship.north = -ship.north;
+	if (ship.east < 0)
+		ship.east = -ship.east;
+
+	printf("%d\n", ship.north + ship.east);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/13/input b/2020/13/input
new file mode 100644
index 0000000..59d4d66
--- /dev/null
+++ b/2020/13/input
@@ -0,0 +1,2 @@
+1006401
+17,x,x,x,x,x,x,x,x,x,x,37,x,x,x,x,x,449,x,x,x,x,x,x,x,23,x,x,x,x,13,x,x,x,x,x,19,x,x,x,x,x,x,x,x,x,x,x,607,x,x,x,x,x,x,x,x,x,41,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,x,29
\ No newline at end of file
diff --git a/2020/13/puzzle-1.py b/2020/13/puzzle-1.py
new file mode 100755
index 0000000..7b21f96
--- /dev/null
+++ b/2020/13/puzzle-1.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		time = int(f.readline())
+		ids = list(map(int, f.readline().replace(",x", "").split(",")))
+
+	ids.sort()
+
+	min = -1
+	x = 0
+	for bus in ids:
+		res = (time + ids[0]) % bus
+		if min < res < ids[0]:
+			min = res
+			x = bus
+
+	for i in range(time, time + ids[0]):
+		if i % x == 0:
+			print((i - time) * x)
+			break
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/13/puzzle-2.py b/2020/13/puzzle-2.py
new file mode 100755
index 0000000..3965488
--- /dev/null
+++ b/2020/13/puzzle-2.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+from functools import reduce
+
+
+def chinese_remainder(n: tuple[int, ...], a: tuple[int, ...]) -> int:
+	sum = 0
+	prod = reduce(lambda a, b: a * b, n)
+	for n_i, a_i in zip(n, a):
+		p = prod // n_i
+		sum += a_i * mul_inv(p, n_i) * p
+	return sum % prod
+
+
+def mul_inv(a: int, b: int) -> int:
+	b0 = b
+	x0, x1 = 0, 1
+	if b == 1:
+		return 1
+	while a > 1:
+		q = a // b
+		a, b = b, a % b
+		x0, x1 = x1 - q * x0, x0
+	if x1 < 0:
+		x1 += b0
+	return x1
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		ids = tuple(map(lambda x: int(x) if x.isdigit() else x, f.readlines()[1].split(",")))
+
+	buses = tuple(filter(lambda x: x != "x", ids))
+	modres = tuple(x if (x := bus - ids.index(bus)) != bus else 0 for bus in buses)
+
+	print(chinese_remainder(buses, modres))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/14/input b/2020/14/input
new file mode 100644
index 0000000..11570c1
--- /dev/null
+++ b/2020/14/input
@@ -0,0 +1,578 @@
+mask = 00X10101X110010011XX0X011X100000X010
+mem[13197] = 47579321
+mem[37394] = 374943
+mem[48509] = 418284
+mem[29793] = 191792725
+mask = 00100X001010010111XX010X10X01100001X
+mem[378] = 9637
+mem[41083] = 1858241
+mem[36394] = 762
+mem[40101] = 15295
+mem[50670] = 9179863
+mem[30384] = 164245
+mem[11676] = 393669095
+mask = 0XX000X1111001010X10XX1101XX00X00100
+mem[17956] = 854
+mem[57595] = 179871
+mem[50596] = 207644327
+mask = X100XX0111X0X1X01101X0X0110010101011
+mem[26867] = 1012
+mem[3061] = 514891024
+mem[35973] = 512
+mask = 01X000111110010X1110X00110000X00000X
+mem[3707] = 123619
+mem[37107] = 7325808
+mem[31906] = 102168
+mask = XX00XX0101100X011100000XX00100000X00
+mem[38336] = 2917310
+mem[7166] = 313228
+mem[41771] = 2741721
+mem[52154] = 89454
+mask = 11001111X110X0XX10XX11101111000X0111
+mem[35611] = 58725
+mem[40227] = 8442431
+mem[10029] = 7334
+mem[13345] = 87327004
+mask = 0XX0X0001010011011010XX0X110XX01X001
+mem[4868] = 493430
+mem[40452] = 18191
+mem[4567] = 330532
+mem[13580] = 1662243
+mask = 001X00011000X1X0X1X0110X110111001011
+mem[2096] = 25174
+mem[15283] = 994663544
+mem[16002] = 1359
+mem[4240] = 704816
+mask = 01000011101001001010110X10011X11XX01
+mem[16210] = 279177
+mem[8996] = 6470256
+mem[31049] = 1371071
+mem[20425] = 9683526
+mem[24986] = 142094045
+mask = 0X001X01X1X0110X10XX0X01X00101111010
+mem[61471] = 23661
+mem[57520] = 246980
+mem[57446] = 4169790
+mask = 001000X11110010111X000X00X0011X01001
+mem[25460] = 1461
+mem[528] = 48572826
+mem[61442] = 1487
+mem[60708] = 1804
+mem[51588] = 36111
+mask = 0X000001111001010X1011100100001X0X0X
+mem[45713] = 3807909
+mem[26867] = 6236
+mem[39186] = 3023142
+mem[46212] = 5671589
+mem[28686] = 10375260
+mask = 00X0000XXX10X1011100X100001X0X100010
+mem[7272] = 1073
+mem[35482] = 1877478
+mask = 01X00XX11110X11X110X1000010XXX101110
+mem[28892] = 2154970
+mem[33403] = 34104
+mem[56124] = 11230
+mem[11265] = 484054168
+mem[36422] = 1080979
+mask = 00000001X11001X1110001X01000101XXXX0
+mem[8445] = 2387
+mem[55775] = 8215
+mask = 110001101110110X10010X00XX1X01010100
+mem[49202] = 4152007
+mem[49938] = 4676666
+mem[58184] = 43886544
+mem[35840] = 8484248
+mem[25642] = 1980350
+mem[37918] = 1692542
+mem[44918] = 43860354
+mask = 0X000X011110010X1100X10X100X1X111100
+mem[24669] = 15051033
+mem[43432] = 1054
+mem[64706] = 21834
+mem[27336] = 773822
+mem[24406] = 420
+mask = 00XX01111X1001001X0001101001111101XX
+mem[48221] = 256859
+mem[1361] = 145480785
+mem[8221] = 32962081
+mem[11649] = 327597066
+mem[6355] = 3866
+mem[33696] = 951794
+mask = X10XX0010110011010111100X010X000000X
+mem[51014] = 577
+mem[38304] = 7416
+mem[34256] = 3748
+mem[12926] = 306
+mem[39297] = 1823498
+mask = 0000X00XXX10011XX000000X10X010100001
+mem[18788] = 7298
+mem[39644] = 7675
+mem[33093] = 416832
+mem[5195] = 6722351
+mem[28000] = 53707945
+mem[5336] = 77314873
+mem[992] = 134079888
+mask = 0000X101110X010011X0000000X011X1X101
+mem[8536] = 401336
+mem[1632] = 1267
+mem[6456] = 581
+mem[31682] = 20542
+mem[27729] = 726
+mem[49447] = 37811
+mask = 0X0X00111XX001XX111X1011010X100X0111
+mem[38677] = 9808
+mem[54045] = 28545
+mem[30384] = 49811
+mem[62515] = 19422
+mem[14508] = 49363
+mask = X100X1X1011X1111011X01101000X11XX101
+mem[59468] = 387
+mem[37138] = 121701873
+mem[18728] = 2624430
+mem[28293] = 5039090
+mem[32321] = 839768
+mem[28535] = 647
+mask = XX100X0010100XX1110X11000110X100X00X
+mem[2147] = 1562
+mem[25832] = 275992750
+mask = 110XX0X10110X11X10X1110X10100X000000
+mem[22152] = 470276298
+mem[60732] = 716
+mem[52727] = 1427169
+mem[16196] = 9596060
+mem[3910] = 28432777
+mask = 01X0001111100X101110110X011XXX01X011
+mem[8221] = 60956
+mem[1223] = 293
+mem[24130] = 777493
+mem[62002] = 3900
+mem[20316] = 26105612
+mem[58295] = 528344031
+mem[12465] = 1159
+mask = 11000X011110010010011100100XX111100X
+mem[59580] = 3601634
+mem[31173] = 325319
+mem[28284] = 2285676
+mem[57595] = 8662764
+mem[32672] = 4111107
+mask = 01000001X1100101XX0X01101X1X00011X0X
+mem[33093] = 4612
+mem[61749] = 5692
+mem[28188] = 26420039
+mem[59026] = 1325
+mem[37032] = 149
+mask = 01000X11111001X11110011X111X01100X01
+mem[23793] = 131971
+mem[10420] = 848652
+mem[10469] = 33394600
+mem[23001] = 1875
+mask = 01001111011X1X1XXX1X001XX11100011X10
+mem[38294] = 371641
+mem[17261] = 72227824
+mem[41143] = 213405737
+mem[54246] = 1445548
+mem[41901] = 1849824
+mask = 0X00110X01101100XX101011001110XX1101
+mem[42925] = 176752065
+mem[17255] = 12010392
+mem[37437] = 64942
+mem[57253] = 827582
+mask = 11X10X101111XX0010X10101100100010110
+mem[14344] = 6638562
+mem[40266] = 89477554
+mem[9511] = 1133
+mem[53072] = 748643130
+mem[4567] = 372
+mem[26565] = 4739
+mask = 00010XX1X11X010X11X000100111001X1110
+mem[4247] = 17837
+mem[18674] = 2031700
+mem[47487] = 89684677
+mask = 110X1X11011X101110111101XX01001100X0
+mem[22046] = 3445
+mem[55657] = 29187
+mem[38510] = 159862
+mask = 0100000X11X00100110X01101X0011001100
+mem[12772] = 3394234
+mem[30255] = 47301946
+mem[55181] = 11825301
+mem[2096] = 239
+mem[6355] = 66264
+mem[62103] = 62751352
+mask = X100010XXX10X1001110001001X10X100X0X
+mem[18880] = 12756
+mem[52727] = 58449492
+mem[52620] = 106260805
+mask = 01000X011110010XX110X11001100X000XXX
+mem[5734] = 3770
+mem[46419] = 12806425
+mem[26866] = 6566928
+mask = X1001XX101101X1X10111X0X1111001101X0
+mem[54847] = 8045
+mem[61036] = 1672
+mem[32929] = 87423486
+mem[48539] = 13896
+mem[14353] = 7009065
+mem[16446] = 32987614
+mask = 00100000X111110X1110X101100000100X00
+mem[23863] = 4070
+mem[52234] = 498973
+mem[20235] = 1706949
+mask = 00X000011110X100110X11100X0X10X01010
+mem[44286] = 26378
+mem[30741] = 14368000
+mem[7396] = 88194752
+mask = 0X001X01X11011X0101X1010XX01X01000X0
+mem[6834] = 2670580
+mem[15903] = 6945101
+mem[10104] = 2517
+mem[65020] = 61602027
+mem[55142] = 1143278
+mem[38596] = 1333
+mem[17509] = 153504934
+mask = 00XX0X01111XX10111X00X10X0111011110X
+mem[568] = 1625
+mem[30255] = 248279
+mem[11912] = 538
+mem[12028] = 520033
+mask = 0010XX011X00X10011X001XX1100X1000001
+mem[15654] = 120
+mem[4292] = 57554
+mem[2096] = 346664
+mem[1248] = 10995
+mem[48539] = 656539
+mem[19181] = 147211
+mask = 1010010X110001001100X1X00X0011010X01
+mem[11344] = 4845730
+mem[60639] = 25030928
+mem[1005] = 12960528
+mem[47688] = 107547855
+mem[17509] = 728745
+mask = X00000011X10X10X11000101101000000100
+mem[46621] = 1608
+mem[5562] = 15064109
+mem[28385] = 1651
+mem[5734] = 288099689
+mem[49319] = 97558812
+mem[37739] = 1161
+mem[52727] = 1992490
+mask = 0001010XX110010X110000X01X10X011XX1X
+mem[37366] = 735085354
+mem[1739] = 409
+mem[12604] = 754989
+mask = 00000X011110010011000X001X0100XX0000
+mem[29851] = 8508
+mem[44133] = 1998890
+mem[24804] = 6068
+mem[59260] = 1198469
+mem[59580] = 10413954
+mask = 00110111X01X010010X00000X10X00110110
+mem[55579] = 418284890
+mem[7573] = 1800
+mem[26096] = 1469134
+mem[44133] = 25531796
+mem[39628] = 7076590
+mask = 0000000111X0010111X001011XX0000X1X00
+mem[24778] = 24875864
+mem[10420] = 3072761
+mem[2096] = 2762
+mem[30148] = 6696
+mem[17770] = 13204967
+mask = 0011010101X00X0X1100X000110011100101
+mem[57742] = 21044093
+mem[33266] = 56667
+mem[61442] = 1636
+mem[51870] = 1018197644
+mem[40469] = 77760
+mask = X0X001XX11000X0011X00100010011X00X01
+mem[11504] = 438885
+mem[53777] = 6130
+mem[17770] = 808014
+mask = 000X001111100101XX100010X010X1100100
+mem[35611] = 1215
+mem[10397] = 301
+mem[10866] = 8375216
+mem[2499] = 10472
+mem[63504] = 270966
+mem[7719] = 2064
+mem[41088] = 343764913
+mask = 010X1X00X1X0X1101X0X00111101001X0101
+mem[20597] = 773
+mem[14657] = 294987038
+mask = 00XX0001X110010111100000X01010100111
+mem[43170] = 365
+mem[55657] = 4882105
+mem[44170] = 628956
+mem[10429] = 947957
+mem[272] = 36059
+mask = 0X000011X0X0010X1X1011110100101XXXX1
+mem[3910] = 2312
+mem[47735] = 89421
+mem[2197] = 32972549
+mem[49938] = 7005
+mask = 00000100X100X100111X0101011X11010101
+mem[54400] = 830
+mem[43977] = 2412350
+mem[18229] = 19157634
+mem[19181] = 879884567
+mask = 000101X11X100100X100011X000100110001
+mem[37237] = 104037633
+mem[29167] = 1094
+mem[6308] = 6007
+mem[21610] = 80462437
+mem[2261] = 345450311
+mask = 0X0000X1111001011110X01X1XX01010X0XX
+mem[10892] = 85035
+mem[38510] = 42597708
+mem[30752] = 2960
+mem[30416] = 123661909
+mem[49045] = 913
+mem[4292] = 75
+mem[17509] = 1382
+mask = 1X00X00111X001X0100101001X110X0001X0
+mem[56241] = 8276
+mem[40782] = 243373
+mem[42397] = 43237586
+mem[13015] = 399
+mem[23129] = 735838
+mem[1385] = 4448
+mask = 0000X011000XX100X110111101X110X010X1
+mem[13015] = 247
+mem[42378] = 546670
+mem[8214] = 63809
+mem[22410] = 155149
+mem[55264] = 454543598
+mem[28778] = 69088880
+mem[48061] = 12489909
+mask = 0XX0X000XX1001X01101001000000100X1X1
+mem[7551] = 11717790
+mem[6107] = 50467
+mem[30752] = 4249755
+mem[17228] = 33884
+mem[59957] = 32163540
+mask = 1X0X0X10111X01001X0101011X0X0X0101X0
+mem[45349] = 1879078
+mem[31733] = 88189
+mem[12577] = 546676501
+mem[53419] = 16199
+mem[59921] = 2546
+mask = 0010001X110001X1X110100101X111000000
+mem[19998] = 179736
+mem[22061] = 30001652
+mem[41371] = 16212851
+mem[64355] = 622251640
+mem[23129] = 98852
+mem[56429] = 266
+mask = 00000X0X11X00XX1100001X0100010X0X100
+mem[37241] = 450
+mem[64833] = 219911344
+mem[16713] = 626602448
+mask = X1X01011X11010111011XX000001X01XX100
+mem[47336] = 15388
+mem[56124] = 582872
+mem[28686] = 27406190
+mem[34623] = 13146
+mem[30384] = 229541309
+mask = X00X011X11100100110X00110001XXX00000
+mem[18660] = 3353
+mem[30741] = 10036798
+mem[47487] = 4090
+mask = 00X0000X11100X011X0001101001X10X10X0
+mem[52567] = 730515
+mem[16156] = 10615261
+mem[29580] = 957414770
+mem[26765] = 19
+mem[24655] = 510031974
+mem[24669] = 30
+mem[46781] = 5769
+mask = 0X0010011110111010X000X0X11X101001X0
+mem[63285] = 8050
+mem[46893] = 981797
+mem[46022] = 984778
+mem[31931] = 67780
+mem[23543] = 3153
+mask = 1100X001X11001X01001X100111X01X0X100
+mem[53172] = 13616323
+mem[31500] = 117639
+mem[59037] = 106552607
+mem[54562] = 3408946
+mem[57159] = 411910
+mem[2824] = 61677145
+mem[47313] = 520051559
+mask = X100010111100100XX0XX110100001010101
+mem[37739] = 3912032
+mem[12772] = 884026
+mem[2217] = 4238
+mem[57159] = 28391
+mem[17146] = 3998
+mask = 00000001111001X11X000110101X1X11X100
+mem[11649] = 516652
+mem[21190] = 526
+mem[6364] = 274816
+mem[25567] = 190071
+mask = XXX00000X111010111001001111000X00000
+mem[25786] = 934
+mem[22026] = 215203
+mask = 0010000110X0110X11X001001101110X0011
+mem[59392] = 400
+mem[59580] = 927
+mem[15208] = 18515970
+mem[59444] = 245687
+mem[36248] = 893
+mem[59134] = 20240
+mask = 0X0XX1X11110X1011010000110000010000X
+mem[11344] = 223586488
+mem[41434] = 519191086
+mem[15028] = 1492592
+mem[25631] = 247281
+mask = 11X0XX1011101000X0011X00X101X1111000
+mem[21825] = 1675
+mem[2371] = 663473
+mem[37724] = 4339
+mem[54246] = 855
+mem[9392] = 56579
+mem[35552] = 14454
+mask = 0100010111100100111X110X00X01000X1X0
+mem[44516] = 482691
+mem[26528] = 1559
+mem[53886] = 89643332
+mem[3478] = 12699372
+mask = 0011010111X00100XXX0XX1X10XX10100001
+mem[27239] = 413074512
+mem[15589] = 3001
+mem[10011] = 1136
+mem[59026] = 852921
+mem[5283] = 213015528
+mask = 00X0000XX11XX10111X0000001X000101000
+mem[17298] = 4088539
+mem[54369] = 505389469
+mem[8221] = 132829
+mem[55115] = 5055
+mem[56330] = 1932140
+mask = 01X00001111001010110111001X00010X0XX
+mem[37467] = 127273625
+mem[38432] = 3166735
+mem[52727] = 998
+mem[42925] = 1733202
+mask = 11010011011011X01X01010XX10110110000
+mem[26085] = 233531
+mem[57079] = 1526
+mem[53172] = 385838419
+mem[29614] = 254712697
+mem[25466] = 735
+mem[27081] = 7719
+mask = 01000000111X0XXX1101X11X001101X01100
+mem[55941] = 72432190
+mem[16199] = 10097889
+mem[45349] = 10650
+mem[62515] = 8214
+mem[59468] = 965897
+mem[16653] = 386447843
+mem[49447] = 413274
+mask = 01000X011110X1XX1XX10X001111000X1000
+mem[59209] = 14316
+mem[50790] = 705222705
+mem[45621] = 232211796
+mask = 010X111101111XX1101000X1011000111011
+mem[48891] = 3231894
+mem[37241] = 49993
+mem[47016] = 3806
+mem[10469] = 12758
+mem[43871] = 17980
+mask = 0XX00XX11110010011X0010X1X011100X000
+mem[28733] = 801341049
+mem[12772] = 20002640
+mem[30741] = 2248
+mask = 0101X01110100X0111XX11110011000XXX01
+mem[17803] = 65414
+mem[45439] = 13886371
+mem[16184] = 130293
+mem[29313] = 1782
+mask = 01000111111001101X0110000001XX1X1111
+mem[34404] = 202755
+mem[43413] = 1045
+mem[48841] = 381434549
+mem[37238] = 230052
+mem[10175] = 421554
+mem[11939] = 15850
+mask = X0XX0011X110010X011000010111110X1XX0
+mem[54847] = 160031
+mem[53915] = 5111
+mem[6036] = 17132
+mem[36183] = 1360055
+mem[47658] = 127563
+mask = 00100X1111X0010101101X11X11111001X10
+mem[25937] = 8673
+mem[12926] = 834
+mem[43356] = 732346
+mem[5734] = 393
+mem[3822] = 30383
+mask = 110001101110XX00100100XX0X11X1XX010X
+mem[821] = 185158312
+mem[64509] = 264189683
+mem[15199] = 1037709
+mem[635] = 437556
+mem[31141] = 14726605
+mem[40468] = 47196
+mask = 00000001XX1001001X0000X01001X0001100
+mem[46740] = 8071
+mem[43144] = 14187193
+mem[51555] = 382
+mem[30741] = 4087
+mem[45411] = 1430
+mem[14377] = 7364
+mask = 11X00110111001001001100X10X1XX00X100
+mem[62803] = 979004797
+mem[4838] = 343
+mem[23241] = 4426
+mask = 001X0101X1100100X1X0X110110XX01001X0
+mem[10799] = 5745
+mem[14789] = 34632
+mem[27068] = 8863
+mask = 001001011XX0010011000111010X10XX0100
+mem[31173] = 109895
+mem[25936] = 4493
+mask = 00000011111X0101X1X01100X00000100000
+mem[32612] = 14472
+mem[22702] = 713
+mem[22779] = 126887839
+mem[43168] = 251908
+mem[11504] = 47004
+mem[7399] = 2215129
+mem[63129] = 4367
+mask = 010001010X10010X111XX1X0111100101X0X
+mem[3663] = 187207677
+mem[52928] = 200
+mem[38852] = 8397
+mem[31461] = 223838656
+mem[64706] = 4205924
+mem[26237] = 218385741
+mem[57402] = 258615472
+mask = 11X0X0X1011001XX1001111X011100XX0000
+mem[55334] = 323423
+mem[5833] = 33097
+mem[26924] = 272
+mem[42957] = 47976862
+mem[18798] = 61419
+mem[19947] = 1287
+mask = 1100X101011X10111X11X000111100111XX0
+mem[64472] = 224734
+mem[18079] = 526
+mem[60870] = 3322170
+mem[4013] = 578
+mem[2606] = 83684765
+mem[17048] = 2503
+mask = 0010000XX0000100110000011X0001X0X00X
+mem[37789] = 94286
+mem[2499] = 13318890
+mem[29793] = 78507
+mem[45621] = 3626886
+mem[34770] = 2407
+mem[54400] = 38740
+mask = 0010X10111000100110001X0X1000100X101
+mem[11265] = 1297549
+mem[16410] = 948310
+mem[33093] = 893977
+mem[17298] = 53047
+mem[45439] = 14869
+mem[21212] = 870451788
diff --git a/2020/14/puzzle-1.py b/2020/14/puzzle-1.py
new file mode 100755
index 0000000..f102316
--- /dev/null
+++ b/2020/14/puzzle-1.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+
+
+def bitmask(mask: str, num: int) -> int:
+	binary = bin(num)[2:]
+	binary = "0" * (36 - len(binary)) + binary
+	res = ""
+
+	for i in range(len(binary)):
+		if binary[i] == "1" and mask[i] == "0":
+			res += "0"
+		elif binary[i] == "0" and mask[i] == "1":
+			res += "1"
+		else:
+			res += binary[i]
+
+	return int(res, 2)
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		lines = f.read().splitlines()
+
+	mem: dict[str, int] = {}
+	mask = ""
+	for line in lines:
+		line = line.split(" ")
+		if line[0] == "mask":
+			mask = line[2]
+		else:
+			mem[line[0][4:-1]] = bitmask(mask, int(line[2]))
+
+	print(sum(mem[val] for val in mem))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/14/puzzle-2.py b/2020/14/puzzle-2.py
new file mode 100755
index 0000000..45fb6ad
--- /dev/null
+++ b/2020/14/puzzle-2.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+
+
+def bitmask(mask: str, num: int) -> tuple[int, ...]:
+	binary = bin(num)[2:]
+	binary = binary.zfill(36)
+	res = ""
+
+	for i in range(len(binary)):
+		if mask[i] == "0":
+			res += binary[i]
+		else:
+			res += mask[i]
+
+	n = res.count("X")
+	combos = tuple(bin(i)[2:].zfill(n) for i in range(2 << n - 1))
+
+	acc: list[str] = []
+	for combo in combos:
+		temp = res
+		for i in range(n):
+			temp = temp.replace("X", combo[i], 1)
+		acc.append(temp)
+
+	return tuple(int(x, 2) for x in acc)
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		lines = f.read().splitlines()
+
+	mem: dict[str, int] = {}
+	mask = ""
+	for line in lines:
+		line = line.split(" ")
+		if line[0] == "mask":
+			mask = line[2]
+		else:
+			address = line[0][4:-1]
+			addresses = bitmask(mask, int(address))
+			for a in addresses:
+				mem[a] = int(line[2])
+
+	print(sum(mem[val] for val in mem))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/15/.gitignore b/2020/15/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/15/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/15/Makefile b/2020/15/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/15/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/15/puzzles.c b/2020/15/puzzles.c
new file mode 100644
index 0000000..64d89bb
--- /dev/null
+++ b/2020/15/puzzles.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef PART2
+	#define BUFFER 2020
+#else
+	#define BUFFER 30000000
+#endif
+
+int
+main(void)
+{
+	/* Given starting numbers */
+	static unsigned int nums[BUFFER] = {0};
+	nums[6] = 1;
+	nums[19] = 2;
+	nums[0] = 3;
+	nums[5] = 4;
+	nums[7] = 5;
+	nums[13] = 6;
+
+	unsigned int temp, lnum = 1;
+	for (int i = 8; i <= BUFFER; i++) {
+		temp = lnum;
+		lnum = nums[lnum] ? i - 1 - nums[lnum] : 0;
+		nums[temp] = i - 1;
+	}
+
+	printf("%u\n", lnum);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/16/input b/2020/16/input
new file mode 100644
index 0000000..2895e57
--- /dev/null
+++ b/2020/16/input
@@ -0,0 +1,269 @@
+departure location: 30-260 or 284-950
+departure station: 29-856 or 863-974
+departure platform: 32-600 or 611-967
+departure track: 44-452 or 473-965
+departure date: 36-115 or 129-950
+departure time: 50-766 or 776-972
+arrival location: 40-90 or 104-961
+arrival station: 40-864 or 887-971
+arrival platform: 32-920 or 932-964
+arrival track: 45-416 or 427-959
+class: 47-536 or 557-964
+duration: 33-229 or 246-969
+price: 25-147 or 172-969
+route: 32-328 or 349-970
+row: 50-692 or 709-964
+seat: 49-292 or 307-964
+train: 28-726 or 748-954
+type: 37-430 or 438-950
+wagon: 46-628 or 638-973
+zone: 39-786 or 807-969
+
+your ticket:
+89,193,59,179,191,173,61,73,181,67,71,109,53,79,83,113,107,139,131,137
+
+nearby tickets:
+499,362,657,143,723,763,935,454,473,586,372,489,214,753,765,65,307,56,853,934
+228,664,709,361,856,645,363,171,901,199,62,513,667,808,350,890,715,687,257,721
+531,490,628,88,947,252,832,917,686,571,362,874,837,588,849,140,655,407,90,611
+777,194,111,386,90,598,153,363,373,566,191,945,559,819,289,487,480,590,691,756
+186,366,196,844,655,659,845,109,355,330,71,176,397,380,822,776,369,447,658,949
+783,763,570,184,260,448,856,717,913,646,774,657,841,917,910,193,941,408,110,577
+378,832,670,59,155,911,209,74,57,947,144,514,411,89,690,856,854,286,597,132
+319,684,204,909,342,206,204,943,620,52,516,115,430,319,84,618,593,211,596,581
+66,146,910,225,107,112,918,679,255,757,125,946,863,892,78,525,373,913,87,838
+674,653,588,220,448,941,112,924,474,358,513,649,766,500,847,197,639,836,373,573
+76,115,776,726,598,361,480,772,356,129,506,380,202,810,932,756,408,81,786,889
+311,620,848,357,483,754,181,300,284,60,259,674,596,289,397,113,894,82,291,754
+84,600,751,223,595,478,198,2,402,428,355,517,947,933,624,59,598,711,752,513
+286,664,786,775,510,363,666,229,914,938,196,509,410,528,681,943,477,850,640,595
+365,17,624,375,640,483,208,258,189,222,889,655,852,326,109,428,758,616,889,288
+566,195,201,949,205,517,672,762,180,886,679,63,596,664,678,596,894,384,321,212
+576,316,480,579,925,328,498,194,191,132,106,863,210,416,351,663,643,218,366,942
+776,60,256,400,368,664,469,53,949,689,569,253,319,717,387,591,845,66,499,566
+620,831,379,712,614,176,682,666,83,197,438,916,535,504,218,377,627,155,429,855
+853,525,865,487,190,940,810,251,786,618,895,580,908,86,578,136,781,562,498,759
+671,625,256,592,177,500,523,50,443,692,650,128,441,832,626,491,252,405,661,756
+597,722,922,721,319,388,653,484,83,142,781,451,106,499,515,672,113,374,911,311
+211,716,176,715,627,286,327,531,566,587,916,431,57,371,894,677,778,193,710,447
+559,508,196,178,844,78,114,662,142,558,514,378,375,694,718,314,384,89,816,562
+290,578,105,478,229,260,752,496,187,937,137,898,69,399,980,638,441,84,589,574
+413,592,841,498,793,214,947,582,827,940,446,572,259,623,213,355,853,360,60,195
+481,764,308,384,131,247,595,756,221,361,175,256,407,255,155,752,781,524,403,640
+74,765,914,319,715,86,316,612,197,640,827,760,926,106,520,818,229,824,623,404
+576,504,694,379,75,528,638,257,482,852,837,563,575,389,686,217,852,684,314,184
+481,679,312,796,358,71,376,830,209,946,69,591,939,357,59,284,522,626,218,825
+355,812,691,377,833,938,139,233,643,764,663,692,722,576,495,843,450,536,359,174
+367,749,373,379,69,753,711,81,445,265,405,624,759,814,311,623,228,290,682,195
+475,841,833,415,13,809,478,70,191,228,934,760,765,508,398,655,907,850,487,54
+198,841,184,84,492,945,429,72,753,572,510,408,827,289,177,559,890,837,987,291
+427,198,192,666,319,369,565,861,512,216,81,899,388,761,683,933,529,515,673,674
+355,188,827,614,178,600,641,181,915,728,934,526,904,136,74,649,187,77,381,498
+751,317,780,190,897,781,65,852,933,69,657,811,517,564,842,877,382,84,56,576
+946,839,941,322,409,318,751,850,215,750,394,578,95,284,902,396,409,51,309,938
+54,400,54,307,290,665,125,507,220,600,214,405,864,217,763,284,382,820,129,910
+722,68,841,521,597,286,722,481,451,145,448,389,61,844,650,487,250,781,149,70
+175,323,322,831,857,137,616,686,408,175,709,903,214,917,414,108,367,827,684,593
+321,820,388,220,368,137,403,523,914,839,64,724,482,307,284,448,585,208,764,988
+86,926,414,213,825,682,473,67,318,144,51,311,814,709,520,687,623,396,949,387
+522,369,139,593,122,210,716,906,406,488,681,753,852,189,71,203,51,145,639,412
+322,368,18,663,903,574,203,363,391,643,205,474,182,517,855,486,890,315,725,82
+60,582,819,529,180,140,570,402,191,594,863,146,614,631,51,593,828,583,184,78
+856,622,291,412,503,532,563,217,404,352,349,406,675,277,292,765,748,493,691,626
+647,849,636,64,479,715,623,132,322,408,524,385,212,328,289,104,82,689,908,650
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+389,810,597,156,190,186,507,725,638,349,86,405,644,947,254,201,391,573,758,826
+500,829,643,858,193,191,485,584,370,940,841,820,832,327,565,389,816,677,819,485
+81,499,388,812,201,848,823,288,715,650,868,307,322,53,780,360,650,491,711,896
+816,443,408,197,316,936,487,792,350,492,287,717,350,201,444,111,579,73,409,289
+509,369,890,671,529,444,428,783,170,139,889,649,905,511,508,410,380,399,203,310
+808,711,711,500,512,227,85,810,940,604,786,74,667,684,400,174,480,224,522,88
+105,897,172,780,432,722,287,529,824,524,52,250,136,219,223,249,384,938,559,856
+827,618,152,625,143,933,529,254,400,257,780,144,182,599,576,376,113,199,353,624
+515,253,651,450,659,382,814,254,522,535,906,180,350,358,725,441,135,591,921,54
+290,354,895,627,399,945,355,311,385,496,756,986,893,80,52,308,414,313,572,599
+211,363,501,189,635,891,131,623,493,109,854,572,190,246,206,562,808,365,889,250
+63,792,659,400,946,835,724,641,566,180,824,892,199,528,175,563,687,571,314,557
\ No newline at end of file
diff --git a/2020/16/puzzle-1.py b/2020/16/puzzle-1.py
new file mode 100755
index 0000000..f4343c8
--- /dev/null
+++ b/2020/16/puzzle-1.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		data = f.readlines()
+
+	i = 0
+	valid: list[int] = []
+	while data[i] != "\n":
+		ranges = data[i].split(": ")[1].split(" or ")
+		for _range in ranges:
+			bounds = tuple(map(int, _range.split("-")))
+			for j in range(bounds[0], bounds[1] + 1):
+				valid.append(j)
+		i += 1
+
+	# Skip to nearby tickets
+	i += 5
+	acc = 0
+
+	for j in range(i, len(data)):
+		fields = tuple(map(int, data[j].split(",")))
+		acc += sum(field for field in fields if field not in valid)
+
+	print(acc)
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/16/puzzle-2.py b/2020/16/puzzle-2.py
new file mode 100755
index 0000000..1060049
--- /dev/null
+++ b/2020/16/puzzle-2.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+
+from functools import reduce
+from operator import mul
+
+
+def not_reduced(label_dict: dict[int, str]) -> bool:
+	for i in label_dict:
+		if len(label_dict[i]) != 1:
+			return True
+	return False
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		data = f.readlines()
+
+	i = 0
+	valid: list[int] = []
+	labels: list[str] = []
+	while data[i] != "\n":
+		labels.append(data[i].split(":")[0])
+		ranges = data[i].split(": ")[1].split(" or ")
+		for _range in ranges:
+			bounds = tuple(map(int, _range.split("-")))
+			for j in range(bounds[0], bounds[1] + 1):
+				valid.append(j)
+		i += 1
+
+	# Skip to nearby tickets
+	i += 5
+
+	vtickets: list[tuple[int, ...]] = []
+	for j in range(i, len(data)):
+		fields = tuple(map(int, data[j].split(",")))
+		check = True
+		for field in fields:
+			if field not in valid:
+				check = False
+				break
+		if check == True:
+			vtickets.append(tuple(map(int, data[j].split(","))))
+
+	label_dict: dict[int, list[str]] = {}
+	for i in range(len(labels)):
+		label_dict[i] = []
+
+	# Triple for loop, gross!
+	for label in labels:
+		valid: list[list[int]] = []
+		ranges = data[labels.index(label)].split(": ")[1].split(" or ")
+		for _range in ranges:
+			bounds = tuple(map(int, _range.split("-")))
+			for i in range(bounds[0], bounds[1] + 1):
+				valid.append(i)
+
+		# For each column
+		for i in range(len(labels)):
+			allvalid = True
+			for ticket in vtickets:
+				if ticket[i] not in valid:
+					allvalid = False
+					break
+
+			if allvalid == True:
+				label_dict[i].append(label)
+
+	# Reduce the label dictionary
+	while not_reduced(label_dict):
+		for i in label_dict:
+			if len((l := label_dict[i])) == 1:
+				for j in label_dict:
+					if l[0] in label_dict[j] and i != j:
+						label_dict[j].remove(l[0])
+
+	my_ticket = tuple(map(int, data[data.index("your ticket:\n") + 1].split(",")))
+	print(reduce(mul, [x for x in my_ticket if "departure" in label_dict[my_ticket.index(x)][0]],))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/17/.gitignore b/2020/17/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/17/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/17/Makefile b/2020/17/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/17/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/17/input b/2020/17/input
new file mode 100644
index 0000000..3b42c23
--- /dev/null
+++ b/2020/17/input
@@ -0,0 +1,8 @@
+...#..#.
+.....##.
+##..##.#
+#.#.##..
+#..#.###
+...##.#.
+#..##..#
+.#.#..#.
\ No newline at end of file
diff --git a/2020/17/puzzles.c b/2020/17/puzzles.c
new file mode 100644
index 0000000..4e98982
--- /dev/null
+++ b/2020/17/puzzles.c
@@ -0,0 +1,104 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* PART2 is defined for part 2, but not for part 1 */
+#ifdef PART2
+	#define MAXTIME 50
+#else
+	#define MAXTIME 1
+#endif
+#define MAXDEPTH  50
+#define MAXHEIGHT 50
+#define MAXWIDTH  50
+
+char space[MAXTIME][MAXDEPTH][MAXHEIGHT][MAXWIDTH];
+char temp[MAXTIME][MAXDEPTH][MAXHEIGHT][MAXWIDTH];
+
+/* Check the cubes around the given coordinates and update the temp array accordingly */
+static void
+update_cube(unsigned int const t, unsigned int const i, unsigned int const j, unsigned int const k)
+{
+	unsigned int active = 0;
+
+	for (int tme = t - 1; tme <= (int) t + 1; tme++) {
+		if (tme < 0 || tme > MAXTIME - 1)
+			continue;
+		for (int dep = i - 1; dep <= (int) i + 1; dep++) {
+			if (dep < 0 || dep > MAXDEPTH - 1)
+				continue;
+			for (int hgt = j - 1; hgt <= (int) j + 1; hgt++) {
+				if (hgt < 0 || hgt > MAXHEIGHT - 1)
+					continue;
+				for (int wid = k - 1; wid <= (int) k + 1; wid++) {
+					if (wid < 0 || wid > MAXWIDTH - 1
+					    || (tme == (int) t && dep == (int) i && hgt == (int) j
+					        && wid == (int) k))
+						continue;
+
+					if (space[tme][dep][hgt][wid] == '#')
+						active++;
+				}
+			}
+		}
+	}
+
+	if (space[t][i][j][k] == '#' && (active == 2 || active == 3))
+		temp[t][i][j][k] = '#';
+	else if (space[t][i][j][k] == '.' && active == 3)
+		temp[t][i][j][k] = '#';
+	else
+		temp[t][i][j][k] = '.';
+}
+
+int
+main(void)
+{
+	/* Initialze space */
+	memset(space, '.', MAXTIME * MAXDEPTH * MAXHEIGHT * MAXWIDTH);
+
+	/* Read input */
+	FILE *fpt = fopen("input", "r");
+	char c;
+	unsigned int t, i, j, k;
+
+	j = k = 0;
+	while ((c = fgetc(fpt)) != EOF) {
+		if (c == '\n') {
+			j++;
+			k = 0;
+		}
+		else {
+			space[MAXTIME / 2][MAXDEPTH / 2][j + MAXHEIGHT / 2][k + MAXWIDTH / 2] = c;
+			k++;
+		}
+	}
+
+	/* Do the boot cycles */
+	for (int cycle = 0; cycle < 6; cycle++) {
+		for (t = 0; t < MAXTIME; t++)
+			for (i = 0; i < MAXDEPTH; i++)
+				for (j = 0; j < MAXHEIGHT; j++)
+					for (k = 0; k < MAXWIDTH; k++)
+						update_cube(t, i, j, k);
+
+		/* Copy temp to space */
+		for (t = 0; t < MAXTIME; t++)
+			for (i = 0; i < MAXDEPTH; i++)
+				for (j = 0; j < MAXHEIGHT; j++)
+					for (k = 0; k < MAXWIDTH; k++)
+						space[t][i][j][k] = temp[t][i][j][k];
+	}
+
+	/* Count the active cubes */
+	unsigned int count = 0;
+	for (t = 0; t < MAXTIME; t++)
+		for (i = 0; i < MAXDEPTH; i++)
+			for (j = 0; j < MAXHEIGHT; j++)
+				for (k = 0; k < MAXWIDTH; k++)
+					if (space[t][i][j][k] == '#')
+						count++;
+
+	printf("%u\n", count);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/18/.gitignore b/2020/18/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2020/18/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2020/18/Makefile b/2020/18/Makefile
new file mode 100644
index 0000000..c32dafa
--- /dev/null
+++ b/2020/18/Makefile
@@ -0,0 +1,7 @@
+all:
+	${CC} ${CFLAGS} -o puzzle-1 puzzles.c
+	${CC} ${CFLAGS} -DPART2 -o puzzle-2 puzzles.c
+
+.PHONY: clean
+clean:
+	rm -f puzzle-[12]
diff --git a/2020/18/input b/2020/18/input
new file mode 100644
index 0000000..c39b341
--- /dev/null
+++ b/2020/18/input
@@ -0,0 +1,379 @@
+6 * 7 * 8 * 9 * ((8 * 3 * 9) * 7 + 2 + 4 * 8 + 2) + 5
+3 * 2 * (5 + (8 + 2 * 2 * 8 + 8) * 8)
+5 + 7 * 8 * 2
+(8 + 5 * 9 + (8 * 9 + 7 + 8)) * 4 * 3 * (8 * 9) * 3
+(7 + 2 + 2 + 5 * 6 * 3) * 8 + 5 * 9
+(9 + (2 * 9 + 6 + 5 + 2 + 7) + 4) + 5 + (9 + (7 + 8 * 6 + 3 * 8) * (5 + 3 * 2 * 9) + 7 * (4 * 5 + 6 + 9)) + 9 * 7 * 4
+5 * (8 + 2 + 9 * 6)
+(4 * 8 + 8 + 5 * (5 * 3 + 7 * 8 + 8 + 2) + 8) * 4 * 2 * 7 + 3 + 8
+6 + 9 * (6 + 7 + (3 + 9))
+(6 * 7) + 2
+9 + (4 * (4 * 2 + 6 + 9) + 2 + 4 * 5 + 9)
+2 * (8 + 6 * 2 * 6 + 2 * (6 + 5 + 9 + 6)) * 2 * 6
+(5 * 7 * 4) * 3 * (3 * 6)
+(2 + 4 + 5 + 2) + 2 * 4 * ((6 + 2 + 3 + 4 + 9 + 8) * 5 + 6) * ((3 + 3 + 5 + 2) * 8 * 5 + 8)
+9 + 8 * (9 + 5 * (2 + 4 * 3 * 2 * 9) * 9) * (5 + 2 + 6 + 3 * 4)
+(4 * 5 + 4) * 7 * (2 * 5 + 4)
+6 + 7 + (2 + (8 + 8) * 6 + 3)
+(8 * (9 * 6 + 2 * 2 * 3) * (2 + 2 * 9 * 6) + 9) * 6 + 2
+2 + ((2 * 6 + 7) + 3 + 3) * 5 + 9 + 2
+5 + 3 + (4 * 3 + 5 * 5 * (8 + 6) * 5) * 9 * 7
+6 * 7 + ((2 * 6 + 4 * 2 + 3) + 7 * 5 + 5)
+(9 + (2 + 7 + 2 * 2) + 5 * 9 * 6) * ((2 * 6 + 6) * 3 + 5 + (2 * 2)) * 4
+6 * ((3 * 4 * 9) * 9 * (4 + 8) + 9 + 3) + (3 * (7 * 9) * 9)
+6 * 4 * 4 * (5 * 2 + 4) * 2
+4 * 4 * 8 * 3 + 5 * (2 + (9 + 8 * 7 + 6 + 3) * 8 + (6 * 7 * 9) + 9)
+7 * ((5 + 2) + 5 * 6 * (4 * 8 * 3 * 9 * 3) * 2 * 6) * ((5 + 7 + 9 * 2 * 4 * 6) + 4 + 3) * (9 + 4 + 7 + 4 * 5 * 9)
+4 * 8 * 4 + 6 * (5 * 7) * (6 * 7 * 3 + 2 + (7 + 6 * 4))
+(4 + 8 + 4) + 7 * (9 + 8 + 8 * 9)
+2 * 7 + 3 * 6 + ((5 + 6 * 9) + (2 + 4 * 6 + 9 * 3 * 9) * 2 + 6 + 2 + 8)
+((3 + 4 * 3) + 4 * 9 + 9 * 7) + 7
+(4 * 7 + 3 * 9) * 3 + 4 * 6 + (9 + 6 * 9 * (6 + 6 + 5 * 4 * 5) + 2)
+2 * (3 + 9 + 9 * 7 * 2) * 2
+7 + 4 + ((8 + 2 + 9) + (9 + 4 * 7) + 2 + 8) + 7 * ((8 * 4 + 8 + 6) * (6 * 6 + 3 * 2 * 3 + 8))
+4 + ((8 * 6) + 5 + 9 + 9 * 4 * (3 * 9 * 7)) * 6 + 4
+8 + 6 + 7 * ((3 * 9 * 2 * 3 + 9 + 7) * (7 * 4 * 8 + 9 * 9))
+7 * ((2 + 3 * 7) + (2 + 6 * 9 + 6 + 7 + 4) * 9)
+(2 + 8 * 6 * 6) + 5 + 6 + 9 + 2
+(5 + (2 + 9 * 7 + 7) + 3 * 2) * 5 + (2 * 7 + 6)
+6 * 8 * 4 * 6 + (9 + 8 + 8 * 6 * (8 + 4 * 4 * 3) + 4) * 8
+7 + 3 + 4 * (6 * 4) * 6 * 8
+2 * 8 + 2 + 6 * (8 + (3 + 8 + 3 + 9 + 6) * 9) + 2
+((5 + 2) + 9 * 6 * (2 + 5) + 8 * 2) * 7 + 4 + 9 * 8
+(3 + 5 + 2) + 3 + 8 + 6 * 6 * 4
+(8 + 9 + 4 + (4 + 5 + 8) + 7 * 6) * 7 * 7 + 3 + 3 * 5
+(8 * 6 * 8 + 6 + 6) + ((5 + 8 + 5 + 6) + 8)
+3 * ((7 * 7) * 2 + 8 + 8) * (6 + 3 + (4 * 5 * 6 * 6)) * 8
+5 + 9 + 3 + 7 + 9 * (5 + 9 * 7 * (9 + 7 * 9 * 7) * 9 * 8)
+3 * (2 * 9 + (8 + 6 * 5) + 9)
+4 + 5 + 9 * 8 * (7 * (5 * 2) * (3 + 7 * 4 + 6 + 8) + 3)
+9 * ((6 * 8 * 3 * 8 * 6) + (3 + 5) + 4)
+(3 + (2 * 6 * 7 * 9 * 2 * 9) * (4 * 8 + 4 + 9) + (4 * 4 * 5)) * 9 * ((3 * 3 + 7 + 5) * 7 + 3 * (4 + 7 * 8 + 8)) * 9
+((4 * 9 * 6 * 4 * 9 + 6) * 7) + 4
+8 * 3 * 7 * ((8 + 3 + 9 * 7 + 3) + 5 * 9)
+(8 + 4 + 6 * (7 * 2) + 8 * 7) * 9 * 5
+2 * 8 + (8 + (4 * 8 + 6) + 7) * 4
+6 * 9 * 6 * 5 + 9 * (3 * 3 * 3 + (7 + 7 + 6 + 2 + 7) * 5)
+(3 * 4 * 5 + (9 * 7 * 3 * 2 * 9) * 4) + 6 + (4 + 9 + 2) * 8
+9 + 5 * 5 * (9 + 7 * 4 * (9 * 9 + 8)) * 6
+8 + ((4 + 5) * 2 + (5 + 5) * 7 + 8 * 5)
+(6 + 8) * (2 * (4 + 6 * 4 * 5 * 9)) * 4 + 5 * 4
+5 * 4 * (7 + 4 + 9 * (7 * 6 + 2 * 3 + 7 * 7) + (2 * 8 + 7 + 3 * 2) * 8) * 6 * 5
+7 * 2 * (9 * 4 * 4) + (5 * 6 * 2 + 6 + 9)
+(7 + 2 * 4 * 5 * 4 * 3) + 5 * (3 * 6 * 6 + 8)
+5 * (6 * 4) + 6 * 2 * 6 * ((6 * 3) * 3 + (7 * 8 * 5 * 5 * 7) * 7 * 9)
+9 * 7 * 9 + 4 * (2 * 3 + 2 + 8 + 2 + (3 + 8 * 9)) * 6
+(3 + 8 * 2 * (8 + 9 * 8 + 7) * 9 + 5) + ((5 * 5 * 3) * 9 + 9 * 3 * 6) + 4 + 8 + 2
+5 + 8 + 9 * 6
+9 * (7 + 5 + 9 * 8 + 5 + 9) + 5 + (3 + 9 * 3 + 6 + 6 + 9) * 8 * 8
+8 * (4 + (9 * 6 * 5 + 2 + 3) * (2 + 3 + 4 * 5 * 8) * 3) + 8 + (5 * (8 + 5 * 3 + 4 + 2 + 2) * 6 + 9 * (5 + 3 * 8 + 5) + 9) + 7
+3 * 6 + (3 * 2 + 3 * 4) + 3
+((5 * 6 + 9 * 6) + 8 * 9 * 8 + 8) + ((3 + 9) * 5 + 6 * 6 + 9) + (9 * 2 + (6 * 9 * 4 * 7 + 9 * 4) + 7 + 2) * 7
+((9 + 9 + 9) + 7 + 2) * 8 + 2 * 7 + 4 * 7
+3 * 4 + (7 + (7 * 7 * 2 + 2 * 2 + 2)) + 9
+(3 + (5 * 2 + 5 * 8) + (5 * 5 + 7) * 6) * 8 * (2 * 7 * 3 + 2 + 9)
+4 * (8 + (6 * 9 * 7) + 3 * 8 * 8 * 3) * (6 * 8 * 3) + 9 * 3
+6 + 5 + 3 * 3
+8 * 4 + (9 + 6 + 9 * (3 * 2 + 8 * 2 + 2) + 7)
+2 + 8 * ((4 * 8 * 8 * 4 * 8 * 7) + (3 + 3 + 6 + 2 + 6) * 8 * 9 * 2 * (8 * 3)) + 3 * 9
+((7 * 2 + 5 + 6 * 3 * 9) * 4) * 8 * 2 + (5 + (3 * 2 + 8)) * 2
+5 + (4 * (4 * 5 + 8 + 7) + 7 + 4) + (6 + 2 + (8 * 7 * 8)) * 4 * 5 * 6
+(6 + 4 + (3 * 6 * 9 + 3) * 5 * 2) + (5 * 3 * (9 + 3 * 3) + (5 + 3 + 6) + (2 + 8 + 5) * 2) + 4 * 7
+(6 * 2 * 7 * 7 + 4 * 2) + 4 + 2
+8 * 3 * 6 + 8 + ((3 + 4) * 3 * 2 * 2 + 8 * (2 * 7 + 2 * 7 + 7 + 6)) * (8 * 8 + 4 * 4 * 3)
+(5 + 5 + (9 * 9 * 5) * 4 + 4 + 4) * 7 * 3 * 2
+8 + (7 + 3 * 2 * 3) + 8 + 7
+3 + 7 * (4 + 5 + 9 + 4) + 5 * (8 + 8 + 5)
+((2 + 4 + 2 * 2) * 6 * 2 * 8 * 6 * 9) * 6
+2 * (2 * (6 + 8) + 5 * 7 * (4 * 2)) * 9
+4 + (4 + 3 * 8) * 3 + (3 * 4 * 3 * (4 * 5 + 7) + 7) * 2
+7 * ((7 + 5 + 9 + 9 * 4 + 3) * 9 * 7 + 5 * 8) + 9
+(4 + 3 * 6 + 2) * 4 * 4 + ((2 + 4 * 3 * 8 + 6 + 3) + 5 + 5) * 6 * 9
+5 * 6
+5 + 7 + 7 + ((3 * 3 * 3 * 2 + 3) * 3 + 2 + 4 * 3)
+2 * (4 * 4 * 8 * 3 + 2) + 2 * 3 + 2 * ((9 * 7 * 3 * 6 + 7) * 4)
+(8 + 9 * 8 * 8 * 7) * 9 + (2 + (9 + 9) * 2 * 9 + 7 * (4 * 9 + 9 + 6 * 8 + 2)) * 9
+7 + 3 + 3 * 9 + 8 * (5 + 7 * 3 * (7 + 8 * 3 + 6 + 3) * 2 + 5)
+(3 + (6 * 9) * 3) + 2 + 7 + 4
+(6 * 8 * 7) * (9 + 4 * 4) * 3 * 2 * ((3 + 3 * 6 + 7 * 6) * (3 + 9 + 5 * 9 * 8) + (7 + 7 * 9 + 2 * 4) + 2 + 4) + 9
+6 + (7 * 7 * 5 + 3 + (8 * 7 * 7) * 4) * 4
+4 + 7
+(7 * (6 * 3 * 5) * 4 * 5 * 7 + 3) + 5 + 6 * 8 * 4 + 5
+2 + 2 * 5 + (8 * 7 + 6 + 7 * 4 + 9)
+(3 + 6) * (2 * (6 * 8 + 6 * 3) * (3 + 9 * 2) * 3) + 8
+(7 * 8 * (5 + 4 + 2 * 8) + 4 * 5) + 5
+(2 * 7 * 4 + 6 * (8 * 9 * 2 * 8 + 7) + 5) * (9 * 7 * (4 + 5) * 3 * 2 + 4) * ((6 * 5) + 9 * 4)
+(6 + 6 * 9 + 6 * 7) * (5 + 9 * (8 + 7 * 4 + 8 * 4 + 2) + (7 + 2 + 8 * 5)) + 3 + (4 * 8 + (7 + 4)) * (2 * (6 + 2 * 4 * 2) * 5 * 5 + 9 + (6 + 8 * 6 * 4 + 9))
+9 + (3 + 8 + (7 + 7 * 3 * 4 * 5))
+9 + 9 * (4 + 9 + 9 * 5) * (8 * (4 + 9 + 3 * 3 + 6))
+8 * 3 + 7 * (7 * (4 + 5))
+2 + (4 + 5 + 2 * 4 * (3 * 6 + 3) * 7)
+(5 + (2 * 6 + 9 * 2 + 5) + 8 * 4) + (2 * 5 * 7 + 2 + (5 * 6 * 5 + 4) * 6) * ((4 + 4 + 7 + 9 * 9) * 6 + 6 * 6 * 8 * (7 + 2 * 6)) + 7 * 8
+3 * 5 * (7 * 4 + 8 * 4 * 6 * 6)
+(2 + 8 + (4 + 8 * 3 + 6) + 5 * 3) + 7 * 6
+7 + (9 * (8 * 4 + 2 * 8 + 9 + 4))
+(5 * 8 + (8 * 6 + 5 + 6 * 9)) * (5 * (3 * 6 + 5 * 6 + 7 + 8) + 5) + 2 * (6 + 6 * 6) + 5
+4 * 6
+((6 * 4 * 5 * 4) + (8 * 3 + 2 * 4 * 9 * 5) * 2 + 4 + 4 + 9) + 6 + 6
+8 * ((4 * 5) * 6 + 9) + (2 + 2 * 4 + 3) * 3 + 4
+2 + 5 * 4 * 6 * (3 * (2 * 9 * 9 + 2 + 2))
+(3 * 4 * 3 + 7 * 9) * 3 * (2 + 6 + 6 + 2)
+7 + (7 * 5 * 7 * (2 + 9 * 5 * 5 + 3))
+5 + 4 * 7 + ((6 + 7 * 9 + 8 + 2) + 5 * 3 * 8)
+5 + (2 + (9 * 8 * 6 + 4 + 6) * (4 * 5 * 6 * 4 + 6) * (9 * 9 + 9 + 5) + 3)
+((9 + 3 * 7 * 5) * 9 * 4 + 9) * 5
+(6 + (6 * 9 * 8 + 4 + 7) * (9 + 2 + 3) + 4 + 6) * 4 + 6 * 5
+6 * (2 * 4 + 7 * 3) * (7 + 3 + 7 + 6 * 7 + 2) + 2 + 6 * 3
+5 * (6 + 4 * 2 * 6 * (3 * 9 + 2) * 8) * 9 * 8
+7 + ((8 + 2 + 2 + 9) * 5) * 2 + 6 + 7 + 4
+(5 * 6 + (2 + 4 * 3 * 5) + 3 * (6 + 3 + 2 * 7 * 3 + 7) * 8) + 4 * 9 * 2 + 5 * 2
+5 * ((7 * 2 + 2 * 3 + 3) * 7 * 3 + 9 + 9)
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\ No newline at end of file
diff --git a/2020/18/puzzles.c b/2020/18/puzzles.c
new file mode 100644
index 0000000..5afbe00
--- /dev/null
+++ b/2020/18/puzzles.c
@@ -0,0 +1,126 @@
+#define _GNU_SOURCE
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static unsigned long long parse_number(void);
+static unsigned long long parse_digit(void);
+static unsigned long long parse_result(void);
+
+#ifdef PART2
+static unsigned long long parse_sum(void);
+static unsigned long long parse_product(void);
+#endif
+
+char *g_current;
+
+/* Convert the current number from a string to an int */
+unsigned long long
+parse_number(void)
+{
+	unsigned long long number = 0;
+	while (isdigit(*g_current))
+		number = number * 10 + *g_current++ - '0';
+
+	return number;
+}
+
+/* Parse the current digit pointed to by `g_current` */
+unsigned long long
+parse_digit(void)
+{
+	if (isdigit(*g_current))
+		return parse_number();
+
+	/* If not a digit, it's a parenthesis */
+	g_current++;
+	unsigned long long result = parse_result();
+	g_current++;
+	return result;
+}
+
+#ifdef PART2
+/* Parse and compute a sum */
+unsigned long long
+parse_sum(void)
+{
+	unsigned long long result = parse_digit();
+
+	while (*g_current == '+') {
+		g_current++;
+		result += parse_digit();
+	}
+
+	return result;
+}
+
+/* Parse and compute a product */
+unsigned long long
+parse_product(void)
+{
+	unsigned long long result = parse_sum();
+
+	while (*g_current == '*') {
+		g_current++;
+		result *= parse_sum();
+	}
+
+	return result;
+}
+#endif
+
+/* Parse and compute a sum */
+unsigned long long
+parse_result(void)
+{
+#ifdef PART2
+	return parse_product();
+#else
+	unsigned long long result = parse_digit();
+
+	while (*g_current == '+' || *g_current == '*') {
+		if (*g_current++ == '+')
+			result += parse_digit();
+		else
+			result *= parse_digit();
+	}
+
+	return result;
+#endif
+}
+
+/* Remove the spaces from user input */
+static void
+remove_spaces(char *str)
+{
+	char const *c = str;
+	do
+		while (*c == ' ')
+			c++;
+	while ((*str++ = *c++));
+}
+
+int
+main(void)
+{
+	FILE *fp;
+	char *line = NULL;
+	size_t len = 0;
+	ssize_t read;
+
+	if (!(fp = fopen("input", "r")))
+		err(EXIT_FAILURE, "fopen");
+
+	unsigned long long acc = 0;
+	while ((read = getline(&line, &len, fp)) != -1) {
+		remove_spaces(line);
+		g_current = line;
+		acc += parse_result();
+	}
+
+	printf("%llu\n", acc);
+	return EXIT_SUCCESS;
+}
diff --git a/2020/19/input b/2020/19/input
new file mode 100644
index 0000000..d45070d
--- /dev/null
+++ b/2020/19/input
@@ -0,0 +1,562 @@
+72: "b"
+45: 46 52 | 9 72
+85: 9 52 | 9 72
+82: 52 87 | 72 77
+133: 52 30 | 72 56
+118: 7 52 | 70 72
+18: 52 113 | 72 52
+119: 72 46 | 52 18
+25: 19 72 | 103 52
+32: 90 52 | 78 72
+50: 113 113
+71: 72 106 | 52 128
+3: 103 72 | 18 52
+41: 86 72 | 19 52
+96: 86 72 | 108 52
+33: 44 52 | 104 72
+127: 52 36 | 72 50
+51: 72 79 | 52 38
+43: 72 50 | 52 106
+14: 32 72 | 129 52
+6: 2 72 | 33 52
+108: 52 72 | 72 52
+129: 6 52 | 82 72
+34: 127 72 | 3 52
+74: 128 52 | 9 72
+80: 52 103 | 72 19
+2: 134 72 | 13 52
+54: 128 72 | 114 52
+19: 72 72 | 113 52
+0: 8 11
+30: 132 72 | 39 52
+60: 72 64 | 52 5
+4: 18 52 | 114 72
+57: 72 71 | 52 54
+111: 52 27 | 72 102
+76: 122 52 | 75 72
+134: 86 52 | 9 72
+49: 17 52 | 81 72
+124: 103 72 | 86 52
+123: 72 28 | 52 121
+117: 18 52 | 86 72
+26: 51 72 | 58 52
+62: 85 52 | 44 72
+55: 126 52 | 92 72
+115: 72 13 | 52 67
+109: 128 72 | 106 52
+52: "a"
+93: 60 52 | 133 72
+64: 67 72 | 84 52
+102: 52 128 | 72 48
+84: 86 52 | 46 72
+77: 41 72 | 21 52
+27: 52 9 | 72 108
+95: 89 72 | 105 52
+36: 52 72
+110: 72 50 | 52 9
+9: 72 72
+120: 72 19 | 52 18
+67: 52 48
+112: 65 72 | 119 52
+75: 62 52 | 123 72
+23: 15 72 | 119 52
+42: 131 52 | 61 72
+94: 52 91 | 72 18
+66: 52 128 | 72 103
+10: 113 108
+37: 52 18 | 72 50
+98: 72 69 | 52 94
+126: 115 52 | 29 72
+79: 59 52 | 94 72
+104: 19 72 | 36 52
+125: 96 72 | 4 52
+122: 52 73 | 72 112
+130: 52 20 | 72 45
+90: 72 40 | 52 88
+132: 103 52
+121: 91 52 | 46 72
+7: 52 114 | 72 128
+5: 52 66 | 72 41
+97: 52 18 | 72 91
+89: 72 109 | 52 116
+53: 52 108 | 72 128
+114: 52 113 | 72 72
+16: 1 52 | 110 72
+113: 72 | 52
+31: 52 14 | 72 12
+69: 52 103 | 72 48
+128: 72 52
+40: 72 3 | 52 83
+101: 63 52 | 127 72
+1: 72 91 | 52 114
+58: 52 111 | 72 99
+13: 19 72 | 9 52
+35: 22 72 | 125 52
+65: 72 114 | 52 91
+12: 52 24 | 72 93
+46: 72 72 | 52 52
+20: 9 72
+73: 72 37 | 52 43
+15: 52 50 | 72 108
+103: 52 52
+106: 72 52 | 72 72
+21: 36 72
+28: 72 50 | 52 46
+78: 72 16 | 52 23
+70: 36 72 | 19 52
+87: 72 107 | 52 47
+116: 19 52 | 106 72
+29: 72 68 | 52 65
+8: 42
+68: 9 52 | 128 72
+99: 110 72 | 25 52
+17: 52 118 | 72 130
+11: 42 31
+48: 52 52 | 72 52
+83: 48 113
+105: 52 100 | 72 80
+61: 55 52 | 26 72
+100: 48 52 | 108 72
+56: 52 53 | 72 74
+63: 52 106 | 72 9
+44: 72 114 | 52 128
+47: 52 50 | 72 36
+107: 52 36 | 72 91
+39: 114 72 | 86 52
+86: 52 72 | 52 52
+24: 52 95 | 72 35
+81: 98 72 | 34 52
+131: 49 52 | 76 72
+92: 52 101 | 72 57
+59: 52 114 | 72 50
+38: 52 74 | 72 124
+88: 97 72 | 10 52
+22: 117 72 | 120 52
+91: 72 72 | 52 72
+
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\ No newline at end of file
diff --git a/2020/19/puzzle-1.py b/2020/19/puzzle-1.py
new file mode 100755
index 0000000..8ca7eb2
--- /dev/null
+++ b/2020/19/puzzle-1.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+from collections import OrderedDict
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		data = f.readlines()
+
+	i = 0
+	rules: list[tuple[str]] = []
+	while data[i] != "\n":
+		rules.append(tuple(x for x in tuple(data[i].split(": "))))
+		i += 1
+
+	tests: list[str] = []
+	for line in data:
+		tests.append(line.strip())
+
+	patterns: dict[str, list[str]] = {}
+
+	# Get "a" and "b" out of the way to do less comparisons in the next loop. Also make use of
+	# this loop to strip newlines off of all the rules.
+	for rule in rules:
+		rules[rules.index(rule)] = (rule[0], rule[1].strip())
+		if len(rule[1]) == 4:
+			patterns[rule[0]] = [rule[1][1]]
+
+	while len(patterns) != len(rules):
+		for rule in rules:
+			if rule[0] in patterns:
+				continue
+
+			res = rule[1].split(" | ")
+			req_rules = list(OrderedDict.fromkeys(" ".join(res).split(" ")))
+			all_in = True
+			for req in req_rules:
+				if req not in patterns:
+					all_in = False
+					break
+			if all_in == True:
+				all_combos: list[str] = []
+				for re in res:
+					re = re.split(" ")
+					if len(re) == 1:
+						all_combos.extend(patterns[re[0]])
+					else:
+						for x in patterns[re[0]]:
+							for y in patterns[re[1]]:
+								all_combos.append(f"{x}{y}")
+						all_combos = list(OrderedDict.fromkeys(all_combos))
+
+				patterns[rule[0]] = all_combos
+
+	print(len([test for test in tests if test in patterns["0"]]))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/2020/19/puzzle-2.py b/2020/19/puzzle-2.py
new file mode 100755
index 0000000..b0efe15
--- /dev/null
+++ b/2020/19/puzzle-2.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+
+from collections import OrderedDict
+from re import search
+
+
+def check(test: str, patterns: dict[str, list[str]]) -> bool:
+	chunks = string_divide(test, 8)
+	search_str = ""
+
+	for chunk in chunks:
+		if chunk in patterns["42"]:
+			search_str += "0"
+		elif chunk in patterns["31"]:
+			search_str += "1"
+		else:
+			return False
+
+	# 42 = 0, 31 = 1
+	res = search(r"^(0)+(1)+$", search_str)
+	return not (not res or search_str.count("0") <= search_str.count("1"))
+
+
+def string_divide(string: str, div: int) -> list[str]:
+	l: list[str] = []
+	for i in range(0, len(string), div):
+		l.append(string[i : i + div])
+	return l
+
+
+def main() -> None:
+	with open("input", "r") as f:
+		data = f.readlines()
+
+	i = 0
+	rules: list[tuple[str]] = []
+	while data[i] != "\n":
+		rules.append(tuple(x for x in tuple(data[i].split(": "))))
+		i += 1
+
+	tests: list[str] = []
+	for line in data:
+		tests.append(line.strip())
+
+	patterns: dict[str, list[str]] = {}
+
+	# Get "a" and "b" out of the way to do less comparisons in the next loop. Also make use of
+	# this loop to strip newlines off of all the rules.
+	for rule in rules:
+		rules[rules.index(rule)] = (rule[0], rule[1].strip())
+		if len(rule[1]) == 4:
+			patterns[rule[0]] = [rule[1][1]]
+
+	while len(patterns) != len(rules):
+		for rule in rules:
+			if rule[0] in patterns:
+				continue
+
+			res = rule[1].split(" | ")
+			req_rules = list(OrderedDict.fromkeys(" ".join(res).split(" ")))
+			all_in = True
+			for req in req_rules:
+				if req not in patterns:
+					all_in = False
+					break
+			if all_in == True:
+				all_combos: list[str] = []
+				for re in res:
+					re = re.split(" ")
+					if len(re) == 1:
+						all_combos.extend(patterns[re[0]])
+					else:
+						for x in patterns[re[0]]:
+							for y in patterns[re[1]]:
+								all_combos.append(f"{x}{y}")
+						all_combos = list(OrderedDict.fromkeys(all_combos))
+
+				patterns[rule[0]] = all_combos
+
+	print(len([test for test in tests if check(test, patterns)]))
+
+
+if __name__ == "__main__":
+	main()
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..562eb47
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,14 @@
+BSD Zero Clause License
+
+Copyright (c) 2021 Thomas Voss
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.