aoc2024/08/part2.c
2024-12-08 07:58:08 +01:00

78 lines
2.2 KiB
C

#include "_.h"
int main(int argc, char **argv) {
if (argc != 2)
return 1;
char *input = argv[1];
char **inputs = str_split(strdup(input), '\n');
int count = 0;
int max_y = strslen(inputs);
int max_x = strlen(inputs[0]);
char display[max_y][max_x];
for (int i = 0; i < max_y; i++)
for (int j = 0; j < max_x; j++)
display[i][j] = '.';
int signals[4096][2] = { [0 ... 4095] = {-1, -1} };
for (int y = 0; inputs[y] != NULL; y++) {
for (int x = 0; inputs[y][x] != '\0'; x++) {
if (!isalpha(inputs[y][x]) && !isdigit(inputs[y][x]))
continue;
for (int i = 0; inputs[i] != NULL; i++) {
for (int j = 0; inputs[i][j] != '\0'; j++) {
if (!isalpha(inputs[i][j]) && !isdigit(inputs[i][j]))
continue;
for (int w = 0; w < 1000; w++) {
if (i == y && j == x)
break;
if (inputs[i][j] != inputs[y][x])
break;
int signal_y = ((i - y) * w + i);
int signal_x = ((j - x) * w + j);
if (signal_y >= max_y ||
signal_y < 0 ||
signal_x >= max_x ||
signal_x < 0) {
break;
}
int continu = 0;
for (int v = 0; signals[v][0] != -1; v++) {
if (signals[v][0] == signal_y &&
signals[v][1] == signal_x) {
continu = 1;
break;
}
}
if (continu == 1)
continue;
display[signal_y][signal_x] = '#';
signals[count][0] = signal_y;
signals[count][1] = signal_x;
count+=1;
}
}
}
}
}
for (int i = 0; i < max_y; i++) {
for (int j = 0; j < max_x; j++) {
printf("%c", display[i][j]);
}
printf("\n");
}
printf("count: %d\n", count);
return 0;
}