aocpp/2019/11.cpp

#include <iostream>
#include <utility>
#include <tuple>
#include <map>

#include <aocpp/Startup.hpp>
#include <aocpp/Coord.hpp>
#include <intcode/intcode.hpp>
using namespace aocpp;
using namespace intcode;

namespace {

auto Compute(Machine machine, ValueType start)
  -> std::map<Coord, ValueType> {

  Coord here {0,0};
  std::map<Coord, ValueType> paint {{here,start}};
  Coord dir {0, -1};

  bool next_color = true;

  Run(machine,
    [&]() { return paint[here]; },
    [&](auto o) {
      if (next_color) {
        paint[here] = o;
      } else {
        dir = (o ? CW : CCW)(dir);
        here += dir;
      }
      next_color = !next_color;
    });

  return paint;
}

} // namespace

auto Main(std::istream & in, std::ostream & out) -> void
{
  auto machine = Machine{ParseStream(in)};
  out << "Part 1: " << Compute(machine, 0).size() << "\nPart 2\n";
  Draw(out, Compute(std::move(machine), 1));
}