68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
#include <iostream>
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#include <stdexcept>
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#include <utility>
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#include <tuple>
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#include <set>
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#include <aocpp/Startup.hpp>
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#include <aocpp/Coord.hpp>
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#include <intcode/intcode.hpp>
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using namespace aocpp;
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using namespace intcode;
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namespace {
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auto Compute1(Machine machine)
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-> std::size_t {
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std::set<Coord> screen;
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Run(machine,
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[]() -> ValueType { throw std::runtime_error{"unexpected input request"}; },
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[&](auto x) {
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auto y = StepOutput(machine);
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auto v = StepOutput(machine);
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if (2 == v) { screen.insert({x,y}); } else { screen.erase({x,y}); }
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});
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return screen.size();
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}
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auto Compute2(Machine machine) {
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ValueType score {0};
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ValueType paddleX {0};
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ValueType ballX {0};
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machine.At(0) = 2;
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Run(machine,
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[&]() {
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return paddleX < ballX ? 1 : paddleX > ballX ? -1 : 0;
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},
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[&](auto x) {
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auto y = StepOutput(machine);
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auto v = StepOutput(machine);
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if (-1 == x && 0 == y) {
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score = v;
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} else {
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switch (v) {
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case 3: // paddle
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paddleX = x;
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break;
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case 4: // ball
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ballX = x;
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break;
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}
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}
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});
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return score;
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}
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} // namespace
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auto Main(std::istream & in) -> void
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{
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auto machine = Machine{ParseStream(in)};
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std::cout << "Part 1: " << Compute1(machine) << std::endl;
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std::cout << "Part 2: " << Compute2(std::move(machine)) << std::endl;
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}
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