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authorThomas Voss <thomasvoss@live.com> 2021-10-29 23:02:39 +0200
committerThomas Voss <thomasvoss@live.com> 2021-10-29 23:02:39 +0200
commite7c9108b95e39d7ea5a29ae06d619c4727f11027 (patch)
tree237261eef3afd0720be77dbcbb9599fa66a24b67 /2020/05
Initial commit
Diffstat (limited to '2020/05')
-rw-r--r--2020/05/.gitignore1
-rw-r--r--2020/05/Makefile6
-rw-r--r--2020/05/input908
-rw-r--r--2020/05/puzzle-1.awk2
-rw-r--r--2020/05/puzzle-2.awk11
-rwxr-xr-x2020/05/puzzles.sh4
-rw-r--r--2020/05/seatids.c37
7 files changed, 969 insertions, 0 deletions
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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+BFFBFBBRRL
+BFBFBFBLLL
+FFBFFFBRLR
+FFBBFBFRLR
+FBBBFFBLRR
+BBFFBFFRRR
+BFFFBFFLRL
+BFBBFBFLLR
+BBFBFFBLRL
+FBBBFBBLLL
+FFBBBBBRLR
+BFBBFBBRLR
+FBBBBFBRLL
+FFBBBBFLRR
+BFFFFFBLRL
+BBFBFBBRRR \ 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;
+}