aoc_omni/c/2022/2/problem.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../../lib/aoc.h"

int round_score(const char *round) {
  int shape = round[2] - 'X' + 1;
  int opponent_shape = round[0] - 'A' + 1;
  int result = (((shape - opponent_shape) + 4) % 3) * 3;
  return shape + result;
}

int main() {
  int total_score = 0;

  char *round;
  while ((round = aoc_read_line()) != NULL) {
    total_score += round_score(round);
  }

  printf("Part 1: %d\n", total_score);

  aoc_free();
  return 0;
}