4 files changed, 67 insertions, 0 deletions
diff --git a/2016/02/.gitignore b/2016/02/.gitignore
new file mode 100644
index 0000000..60d075d
--- /dev/null
+++ b/2016/02/.gitignore
@@ -0,0 +1 @@
+puzzle-[12]
diff --git a/2016/02/Makefile b/2016/02/Makefile
new file mode 100644
index 0000000..de3f940
--- /dev/null
+++ b/2016/02/Makefile
@@ -0,0 +1 @@
+include ../../Makefiles/c.mk
diff --git a/2016/02/input b/2016/02/input
new file mode 100644
index 0000000..68cea45
--- /dev/null
+++ b/2016/02/input
@@ -0,0 +1,5 @@
+LLLUDRDLLULDUDLLRLUDURULDURRRRLLURLDLDDDULLDDUDLRDLRDUURRDUUDLLRUUDDLULURDLRDUUDUDRURULLLLDRULDDLRDDRDLRDDLURLDDUDLLUUDLRDDDDLULUUURRDLUUDDLULLURRRDULLUDUDRDRDDRLDLLRLRDDDRDLULLUULDLLLRRDDUURUURDLLDRRDDLRULDLLDRLLUDRRDLUUULDLURLLDDURRUULLLLLRLUDLDDLLLURRRDUDULRULULDDLLDLRDDDUULRLRDUURLURRUDDURRUUDUDLDDLDULDDDDDULRULRDLRLDLRDLDDLUDRDUUDLDUDUDLLLRLUUDRUDDDRDRURRLLLDLUULDUULRDLULLUURLDRRRLDRLUDRRURLDULULDRUDDULLLDRDLLULUDDDDRDRULDULRRRRDDRULDLRDU
+DLDDRRDLLDUURRLULLLLRDRLUDURLDRRDURRRRUUDDUDRRDDDRRLDDLDDLURDLDRLUDULDUDUUDDDLLULRRLLUDULLLUULDDRDDUDUUDULURULULLDRLRUURDRDDLRRUDRUULLLLURRUDRDULDDRURRURLLLLLRLLLRLLUDUDLRDLULDUDLULLLUUDLLDDDUDUDLLRRDLRDLLLRRLRUDRDUDRURLUUURULLDDDDLLURDULURRLLLRLRRULLRRRLUUULLLLRLRDUURRDUURLLLDRDURRRULDDUDRRDLRLDLLRUDDLLUDRLLUUDRLLLLLLUDLURLLRUDRUUUULDLUDULLDDDDRLURUURDDDURRRLRLUDUUDURDDDDRRLRDLURDDLLULDRDDURLLURULUUUUURDUUULDRRLLURRRRRLDDUULLRULLDLDLDLRRRDRLDRUUD
+RLDRRRURULDLUDLDUDLLDUUURRDUDDURULLRRDDULUUDRRRULRUURRRLUUULRDRUDRRLLRLURDLDRDRDLLUDRUULRUDRUDDRURLRLURRDDRRURUUDRRDDRURURUDUUUDUDRRLRDRUUURLLUUUDLRUUDDRDDDDLDRLRDUDDULDDLRLLRURLLURLDDLDLDDULLDDUUURDLRUDUUDLDURDDRUULDRDDRDDDUUUDRDRDDRRDRRDLRDRURDUDDLUUUDULLUULULULRDRUUDDURURDRRRRLUDLDUDURLDRURDLLUUUDLRRDRRURDDULULURLDUDDLUDLDDLLRLDULLULULURUURLDULUDLLUUDLDDULDRRDDUULLUDLDLLRDRDURDDURDDURLDDURUURLLRURURUDDURRDRLRLDDUUDUULRDLLURRRRULURULDUDUDDUDDRLLLDLURDUURUURLUULRRLDLULDDRLDDUURULURUDRD
+URLDDRLLRRLDRLLRRURURURDDLRRRUUUURULRRUUDLUDRULLDLRUDDLULRUULDULURLLRLLUDDUDLURDRRRRLURULRURRURRULRRRULDLLDDLRLUDULUUUDDUDDRRDDDDUULRRLDRRULULRDUURRLDDRDULDURUDUDDLDLLURDDLDDRUDUUUDUUURDLDUDUUULLDLRDULRRRDLLURLDLLULRDDULULURLRLUULRLLLDDDUDLLDLURRRULRDUDDLULUDRUDDURULRLRUDDURLLURULLURDRULDUDLDULRRDLDURLUURRDDUDDUDRURUDDURRUUDURUULLLLDDRDDDDDULUUDDURRULLDRRLRRRRRDDRUUDDDURDRDRUDDUULDUDRRDRULUURLURLUDUDULDDRDULDLRUUDLLLRRLRDRDDUUULRDUDLUDLURRDUURDULDRLLDRDULDUDUULRLLDLRLDLUUDLRUULDUUULDLRLRLUULLLLRLRDUDRUUDURLDUDRRURLRUDRRLRDDLRDDLDDUDDDRLRLLRLUUURLURRRLULRLLDRLRDDRRDRL
+DLLLLLLRLRDRUDLRLLRLDLRURRUURLDLDDDDDUDUULLLLRRLRRDUUDUDLULLRRDULUDLLULURLRULURUULRLURDUDLUDULULUUURLRUDULURULRURULURLRLDRRRRLUDLLDULLDDLLULUURRULRDURDUUDDDURRUDLLLLRLDLUDDULLDUDDURURURRRRULDULULUDDUUDRLRLLLDLLLUUUURUDUUDLDLLRLRDDUULLUURLDDLRRDRLULDLULRULDLDURLULUURRRUDLLRDLUDDULRULULUDDURDLUUURDUUURDUDURLUUDRLUDRULUDDRRDLUUDLLLRDDDDDDLDURDDLDRDLUUDRULLUDRDLDULLULDDRUUDRRLRURRUULLRLRDUUURRDRRDULDDULUUDDURLULRLRURLLRRR
diff --git a/2016/02/puzzles.c b/2016/02/puzzles.c
new file mode 100644
index 0000000..81f6b5f
--- /dev/null
+++ b/2016/02/puzzles.c
@@ -0,0 +1,60 @@
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(void)
+{
+	int x, y, ch;
+#ifdef PART1
+	int keypad[][5] = {
+		{0, 0, 0, 0, 0},
+		{0, 1, 2, 3, 0},
+		{0, 4, 5, 6, 0},
+		{0, 7, 8, 9, 0},
+		{0, 0, 0, 0, 0}
+#elif defined PART2
+	int keypad[][7] = {
+		{0, 0,  0,   0,   0,  0, 0},
+		{0, 0,  0,   1,   0,  0, 0},
+		{0, 0,  2,   3,   4,  0, 0},
+		{0, 5,  6,   7,   8,  9, 0},
+		{0, 0, 'A', 'B', 'C', 0, 0},
+		{0, 0,  0,  'D',  0,  0, 0},
+		{0, 0,  0,   0,   0,  0, 0},
+#endif
+	};
+	FILE *fp = fopen("input", "r");
+
+	if (fp == NULL)
+		err(EXIT_FAILURE, "fopen: 'input'");
+
+	x = y = 3;
+	while ((ch = fgetc(fp)) != EOF) {
+		switch (ch) {
+		case 'U':
+			if (keypad[y - 1][x] != 0)
+				y--;
+			break;
+		case 'D':
+			if (keypad[y + 1][x] != 0)
+				y++;
+			break;
+		case 'L':
+			if (keypad[y][x - 1] != 0)
+				x--;
+			break;
+		case 'R':
+			if (keypad[y][x + 1] != 0)
+				x++;
+			break;
+		case '\n':
+			putchar(keypad[y][x] <= 9
+			        ? keypad[y][x] + '0'
+			        : keypad[y][x]);
+		}
+	}
+
+	putchar('\n');
+	fclose(fp);
+}