aocpp/2019/19.cpp

#include <iostream>

#include <aocpp/Coord.hpp>
#include <aocpp/Startup.hpp>
#include <intcode/intcode.hpp>

using namespace aocpp;
using namespace intcode;

namespace {

class Scanner {
  Machine machine_;

public:
  Scanner(Machine machine) : machine_{std::move(machine)} {}

  auto operator()(ValueType x, ValueType y) const -> bool {
    Machine m {machine_};
    StepInput(m, x);
    StepInput(m, y);
    return StepOutput(m);
  }
};

auto Part1(Scanner const& scanner) {
  std::int64_t count {};
  for (std::int64_t y = 0; y < 50; y++) {
    for (std::int64_t x = 0; x < 50; x++) {
      if (scanner(x, y)) {
        count++;
      }
    }
  }
  return count;
}

auto Part2(Scanner const& scanner) {
  ValueType x = 0;
  for(ValueType y = 99;; y++){
    for (; !scanner(x, y); x++);
    if (scanner(x+99,y-99)) { return 10000 * x + y-99; }
  }
}

} // namespace

auto Main(std::istream & in, std::ostream & out) -> void
{
  auto const scanner = Scanner{Machine{ParseStream(in)}};
  out << "Part 1: " << Part1(scanner) << std::endl;
  out << "Part 2: " << Part2(scanner) << std::endl;
}