src/2017/day13/aoc.cpp


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#include "aoc.h"

namespace aoc2017 {

bool delay_at(int t, const std::vector<scanner>& vs) { 
  for (auto& s : vs) {
    if (s.at_level(s.depth + t) == 0) {
      return false;
    }
  }
  return true;
}

std::pair<int64_t, int64_t> day13(line_view file) {
  std::vector<scanner> vs;
  per_line(file, [&vs](line_view lv) {
    vs.emplace_back(lv);
    return true;
  });

  int severity{0};
  for (auto& s : vs) {
    if (s.at_level(s.depth) == 0) {
      // s.print();
      severity += s.depth * s.range;
    }
  }

  int delay{0};
  while (!delay_at(delay, vs)) {
    delay++;
  }

  // for (auto& s: vs) {
  //   s.print();
  // }
  return {severity, delay};
}
} // namespace aoc2017