aoc-2021-solution-day1-part2-main.cc

int main(int argc, char *argv[]) {
  if (argc != 2) {
    std::cerr << "This program expects one parameter that is the input file to read.\n";
    return 1;
  }
  std::ifstream input(argv[1]);
  if (!input.is_open()) {
    std::cerr << "Failed to open file.\n";
    return 1;
  }

  std::cout << "The measured depth averaged over a sliding window of 3 elements increased in " 
    << count_increasing_windows(input) << " cases.\n";

  return 0;
}