Day 20: Add C solution
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72E154B8622EC191
2 changed files with 220 additions and 0 deletions
102
20/input.txt
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102
20/input.txt
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118
20/solution.c
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118
20/solution.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void pbm(char *front, size_t stride) {
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printf("P1\n%lu %lu\n", stride, stride);
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for (size_t i = 0; i < stride * stride; i++) {
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putchar(front[i] ? '1' : '0');
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}
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}
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int main(int argc, char **argv) {
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int vis = 0, opt;
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long long maxiter = 50;
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while ((opt = getopt(argc, argv, "vi:")) != -1) {
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switch (opt) {
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case 'v':
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vis = 1;
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break;
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case 'i':
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maxiter = atoll(optarg);
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break;
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default:
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usage:
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fprintf(stderr, "Usage: %s [-v] [-i iterations] input\n\n"
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"-v output is NetPBM, readable by FFmpeg\n",
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argv[0]);
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return 1;
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}
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}
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if (optind >= argc)
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goto usage;
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char *algo = NULL, *front = NULL, *back = NULL, *s;
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size_t stride = 0, S = 0, G = 0;
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FILE *fp = fopen(argv[optind], "r");
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if(!fp) {
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fprintf(stderr, "%s: Could not open file '%s': ",
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argv[0], argv[optind]);
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perror("");
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return 1;
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}
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fscanf(fp, "%ms", &algo);
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while (fscanf(fp, "%ms\n", &s) == 1) {
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size_t len = strlen(s);
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char *dst;
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if (!stride) {
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stride = len * 3;
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front = calloc(stride * stride, 1);
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dst = front + stride * len;
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}
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dst += len;
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for (size_t c = 0; c < len; c++)
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*dst++ = s[c] == '#';
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dst += len;
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free(s);
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}
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fclose(fp);
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back = malloc(stride * stride);
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memcpy(back, front, stride * stride);
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for (long long iter = 0; iter < maxiter; iter++) {
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if (vis && iter & 1) pbm(front, stride);
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if (iter == 2) {
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for (int p = 0; p < stride * stride; p++)
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S += front[p];
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}
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#pragma omp parallel for
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for (size_t y = 0; y < stride; y++) {
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for (size_t x = 0; x < stride; x++) {
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int v = 0;
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for (int yy = -1; yy <= 1; yy++) {
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for (int xx = -1; xx <= 1; xx++) {
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v <<= 1;
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if (y + yy > 0 && y + yy < stride &&
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x + xx > 0 && x + xx < stride)
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v |= front[(y + yy) * stride + x + xx];
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else
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v |= iter & 1;
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back[y * stride + x] = algo[v] == '#';
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}
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}
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}
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}
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char *tmp=front;
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front=back;
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back=tmp;
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}
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for (size_t p = 0; p < stride * stride; p++)
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G += front[p];
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fprintf(stderr, "Silver: %lu\nGold: %lu\n", S, G);
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free(front);
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free(algo);
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free(back);
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}
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