diff options
Diffstat (limited to '12')
| -rw-r--r-- | 12/input | 793 | ||||
| -rw-r--r-- | 12/part1.c | 78 | ||||
| -rw-r--r-- | 12/part2.c | 66 | ||||
| -rw-r--r-- | 12/testinput | 5 |
4 files changed, 942 insertions, 0 deletions
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+ +int solve(const char *filename) +{ + FILE *file = fopen(filename, "r"); + + // Include space for newline and string terminator + char buffer[8] = { 0 }; + + enum direction dir = East; + int hor = 0; + int ver = 0; + while (fgets(buffer, 8, file)) { + int n = atoi(buffer + 1); + switch (buffer[0]) { + case 'N': + ver += n; + break; + case 'E': + hor += n; + break; + case 'S': + ver -= n; + break; + case 'W': + hor -= n; + break; + case 'F': + switch (dir) { + case North: + ver += n; + break; + case East: + hor += n; + break; + case South: + ver -= n; + break; + case West: + hor -= n; + break; + } + break; + case 'R': + dir = (enum direction)(((int)dir + (n / 90)) % 4); + break; + case 'L': + dir = (enum direction)((abs(4 + ((int)dir - (n / 90))) % 4)); + break; + default: + break; + } + } + + fclose(file); + + return abs(ver) + abs(hor); +} + +int main(int argc, char *argv[]) +{ + printf("%i\n", solve(argv[argc - 1])); +} diff --git a/12/part2.c b/12/part2.c new file mode 100644 index 0000000..745b56c --- /dev/null +++ b/12/part2.c @@ -0,0 +1,66 @@ +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <malloc.h> +#include <string.h> + +#include "../utils.h" + +int solve(const char *filename) +{ + FILE *file = fopen(filename, "r"); + + // Include space for newline and string terminator + char buffer[8] = { 0 }; + + int w_x = 10; + int w_y = 1; + int y = 0; + int x = 0; + while (fgets(buffer, 8, file)) { + int n = atoi(buffer + 1); + switch (buffer[0]) { + case 'N': + w_y += n; + break; + case 'E': + w_x += n; + break; + case 'S': + w_y -= n; + break; + case 'W': + w_x -= n; + break; + case 'F': + for (int i = 0; i < n; i++) { + x += w_y; + y += w_x; + } + break; + case 'R': + for (int i = 0; i < n / 90; i++) { + SWAP(w_y, w_x); + w_y = -w_y; + } + break; + case 'L': + for (int i = 0; i < n / 90; i++) { + SWAP(w_y, w_x); + w_x = -w_x; + } + break; + default: + break; + } + } + + fclose(file); + + return abs(x) + abs(y); +} + +int main(int argc, char *argv[]) +{ + printf("%i\n", solve(argv[argc - 1])); +} diff --git a/12/testinput b/12/testinput new file mode 100644 index 0000000..d382291 --- /dev/null +++ b/12/testinput @@ -0,0 +1,5 @@ +F10 +N3 +F7 +R90 +F11 |