70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
#include <algorithm>
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#include <concepts>
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#include <iostream>
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#include <optional>
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#include <utility>
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#include <vector>
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#include <aocpp/Startup.hpp>
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#include <intcode/intcode.hpp>
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using namespace intcode;
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namespace {
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template <class R> auto Controller(Machine machine, R const ¶ms) {
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auto& i = std::get<Input>(Step(machine)).input;
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std::vector<Machine> amps;
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amps.reserve(params.size());
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for (auto p : params) {
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i = p;
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amps.push_back(machine);
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}
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return amps;
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}
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template <class R>
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auto Feed(R &&s, ValueType start) -> std::optional<ValueType> {
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for (auto &m : amps) {
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auto e = Step(m);
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if (auto i = std::get_if<Input>(&e)) {
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i->input = start;
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start = StepOutput(m);
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} else {
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return {};
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}
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}
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return {start};
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}
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auto compute1(Machine machine, std::vector<ValueType> const ¶ms)
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-> ValueType {
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return *Feed(Controller(std::move(machine), params), 0);
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}
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auto compute2(Machine machine, std::vector<ValueType> const ¶ms)
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-> ValueType {
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auto amps = Controller(std::move(machine), params);
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ValueType last = 0;
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while (auto next = Feed(amps, last)) {
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last = *next;
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}
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return last;
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}
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template <std::invocable<Machine, std::vector<ValueType> const &> F>
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auto optimize(Machine machine, std::vector<ValueType> params, F f) {
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ValueType best = 0;
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do {
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best = std::max(best, f(machine, params));
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} while (std::next_permutation(params.begin(), params.end()));
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return best;
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}
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} // namespace
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auto main(int argc, char** argv) -> int {
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auto fin = aocpp::Startup(argc, argv);
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auto machine = Machine{ParseStream(fin)};
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std::cout << "Part 1: " << optimize(machine, {0, 1, 2, 3, 4}, compute1) << std::endl;
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std::cout << "Part 2: " << optimize(std::move(machine), {5, 6, 7, 8, 9}, compute2) << std::endl;
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}
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