#include <stdio.h>
#include <stdbool.h>

int part_1(FILE *input) {
  rewind(input);

  int frequency = 0;
  int current_line = 0;
  while(fscanf(input, "%d", &current_line) > 0) frequency += current_line;

  return frequency;
}

int part_2(FILE *input) {
  rewind(input);

  bool frequencies[2000000] = {0};
  int frequency = 0;
  int current_line = 0;
  bool found = false;
  while(!found) {
    while(fscanf(input, "%d", &current_line) > 0) {
      frequency += current_line;
      if (frequencies[frequency + 1000000]) {
	found = true;
	break;
      }
      frequencies[frequency + 1000000] = true;
    }
    rewind(input);
  }

  return frequency;
}

int main() {
  char *input_file_path = "../data/2018/1/input.txt";
  FILE *input = fopen(input_file_path, "r");
  if (input == NULL) {
    printf("Can't open file %s\n", input_file_path);
    return 1;
  }

  printf("Part 1: %d\n", part_1(input));
  printf("Part 2: %d\n", part_2(input));

  fclose(input);
}