60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
//
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// Created by Matthew Gretton-Dann on 09/12/2022.
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//
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#include <array>
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#include <iostream>
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#include <numeric>
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#include <string>
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#include <utility>
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using Int = std::int64_t;
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using UInt = std::uint64_t;
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struct State
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{
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auto addx(UInt incr, Int delta)
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{
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pc_ += incr;
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if (current_sample_ != sample_points_.end() && *current_sample_ < pc_) {
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std::cout << "Sample point: " << *current_sample_ << " value: " << x_ << " score "
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<< x_ * *current_sample_ << " total " << score_ << '\n';
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score_ += x_ * *current_sample_;
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++current_sample_;
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}
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x_ += delta;
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}
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[[nodiscard]] auto score() const noexcept -> Int { return score_; }
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Int x_{1};
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Int score_{0};
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UInt pc_{1};
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static std::array<UInt, 6> const sample_points_;
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std::array<UInt, 6>::const_iterator current_sample_{sample_points_.begin()};
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};
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std::array<UInt, 6> const State::sample_points_ = {20, 60, 100, 140, 180, 220};
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auto main() -> int
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{
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std::string line;
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State state;
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using namespace std::literals::string_literals;
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while (std::getline(std::cin, line) && !line.empty()) {
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if (line == "noop"s) {
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state.addx(1, 0);
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}
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else if (line.substr(0, 5) == "addx "s) {
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state.addx(2, std::stoll(line.substr(5)));
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}
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else {
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std::cerr << "Unable to interpret: " << line << '\n';
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return EXIT_FAILURE;
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}
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}
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std::cout << "Score: " << state.score() << '\n';
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return 0;
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}
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