advent2025

Advent of Code 2025 Solutions
git clone git://bsandro.tech/advent2025
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day07.c (657B)

      1 #include <stdio.h>
      2 #include <inttypes.h>
      3 #include "cputime.h"
      4 
      5 #define W 144
      6 #define H 144
      7 
      8 int main(void) {
      9     int x = 1;
     10     int64_t beams[W] = {0};
     11     int p1 = 0;
     12     for (int c=getchar();c!=EOF;c=getchar()) {
     13         if (c=='\n') {
     14             x = 1;
     15         } else {
     16             if (c=='^' && beams[x]!=0) {
     17                 beams[x-1] += beams[x];
     18                 beams[x+1] += beams[x];
     19                 beams[x] = 0;
     20                 p1++;
     21             }
     22             if (c=='S') beams[x] = 1;
     23             x++;
     24         }
     25     }
     26     int64_t p2 = 0;
     27     for (int i=0;i<W;++i) p2 += beams[i];
     28     printf("p1: %d\np2: %"PRIi64"\n", p1, p2);
     29     return 0;
     30 }