71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
#include <iostream>
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#include <utility>
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#include <tuple>
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#include <set>
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#include <intcode.hpp>
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using namespace intcode;
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namespace {
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using Coord = std::pair<ValueType, ValueType>;
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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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for (;;) {
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auto effect = machine.Step();
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if (std::holds_alternative<Halt>(effect)) {
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return screen.size();
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}
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auto x = std::get<Output>(effect).val;
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auto y = std::get<Output>(machine.Step()).val;
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auto v = std::get<Output>(machine.Step()).val;
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if (2 == v) { screen.insert({x,y}); } else { screen.erase({x,y}); }
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}
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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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for(;;) {
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auto effect = machine.Step();
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if (std::holds_alternative<Halt>(effect)) {
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return score;
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} else if (auto i = std::get_if<Input>(&effect)) {
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i->pos = paddleX < ballX ? 1
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: paddleX > ballX ? -1 : 0;
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} else {
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auto x = std::get<Output>(effect).val;
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auto y = std::get<Output>(machine.Step()).val;
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auto v = std::get<Output>(machine.Step()).val;
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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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}
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}
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} // namespace
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auto main() -> int {
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auto machine = Machine{ParseStream(std::cin)};
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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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