105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
#include <cstdint>
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#include <iostream>
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#include <sstream>
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#include <stdexcept>
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#include <string>
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#include <vector>
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#include <doctest.h>
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#include <aocpp/Startup.hpp>
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namespace {
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auto Execute(std::istream & in) -> std::vector<std::int64_t>
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{
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std::int64_t x {1}; // current register value (defined to start at 1)
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std::int64_t d; // change in register value
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std::string instruction;
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std::vector<std::int64_t> snapshots;
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while (in >> instruction) {
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snapshots.push_back(x);
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if ("addx" == instruction) {
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snapshots.push_back(x);
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if (!(in >> d)) {
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throw std::runtime_error{"missing operand"};
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}
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x += d;
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} else if ("noop" != instruction) {
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throw std::runtime_error{"bad instruction"};
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}
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}
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return snapshots;
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}
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auto Part1(std::vector<std::int64_t> const& snapshots) -> std::int64_t
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{
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std::int64_t result {0};
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for (auto i : {20,60,100,140,180,220}) {
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result += i * snapshots[i-1];
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}
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return result;
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}
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auto Part2(std::vector<std::int64_t> const& snapshots, std::ostream & out) -> void
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{
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auto constexpr rows {6};
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auto constexpr cols {40};
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if (snapshots.size() < rows * cols) {
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throw std::runtime_error{"snapshots too short"};
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}
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auto cursor = snapshots.begin();
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for (int r = 0; r < rows; r++) {
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for (int c = 0; c < cols; c++) {
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auto const d = *cursor++ - c;
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out << (-1 <= d && d <= 1 ? "█" : "░");
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}
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out << std::endl;
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}
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}
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} // namespace
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TEST_SUITE("2022-10 examples") {
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TEST_CASE("example") {
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std::istringstream in {
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"addx 15\naddx -11\naddx 6\naddx -3\naddx 5\naddx -1\naddx -8\naddx 13\naddx 4\nnoop\n"
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"addx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx 5\naddx -1\naddx -35\n"
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"addx 1\naddx 24\naddx -19\naddx 1\naddx 16\naddx -11\nnoop\nnoop\naddx 21\naddx -15\n"
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"noop\nnoop\naddx -3\naddx 9\naddx 1\naddx -3\naddx 8\naddx 1\naddx 5\nnoop\nnoop\nnoop\n"
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"noop\nnoop\naddx -36\nnoop\naddx 1\naddx 7\nnoop\nnoop\nnoop\naddx 2\naddx 6\nnoop\n"
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"noop\nnoop\nnoop\nnoop\naddx 1\nnoop\nnoop\naddx 7\naddx 1\nnoop\naddx -13\naddx 13\n"
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"addx 7\nnoop\naddx 1\naddx -33\nnoop\nnoop\nnoop\naddx 2\nnoop\nnoop\nnoop\naddx 8\nnoop\n"
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"addx -1\naddx 2\naddx 1\nnoop\naddx 17\naddx -9\naddx 1\naddx 1\naddx -3\naddx 11\nnoop\n"
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"noop\naddx 1\nnoop\naddx 1\nnoop\nnoop\naddx -13\naddx -19\naddx 1\naddx 3\naddx 26\n"
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"addx -30\naddx 12\naddx -1\naddx 3\naddx 1\nnoop\nnoop\nnoop\naddx -9\naddx 18\naddx 1\n"
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"addx 2\nnoop\nnoop\naddx 9\nnoop\nnoop\nnoop\naddx -1\naddx 2\naddx -37\naddx 1\naddx 3\n"
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"noop\naddx 15\naddx -21\naddx 22\naddx -6\naddx 1\nnoop\naddx 2\naddx 1\nnoop\naddx -10\n"
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"noop\nnoop\naddx 20\naddx 1\naddx 2\naddx 2\naddx -6\naddx -11\nnoop\nnoop\nnoop\n"
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};
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auto snapshots = Execute(in);
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CHECK(13140 == Part1(snapshots));
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std::ostringstream out;
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Part2(snapshots, out);
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CHECK(out.str() ==
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"██░░██░░██░░██░░██░░██░░██░░██░░██░░██░░\n"
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"███░░░███░░░███░░░███░░░███░░░███░░░███░\n"
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"████░░░░████░░░░████░░░░████░░░░████░░░░\n"
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"█████░░░░░█████░░░░░█████░░░░░█████░░░░░\n"
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"██████░░░░░░██████░░░░░░██████░░░░░░████\n"
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"███████░░░░░░░███████░░░░░░░███████░░░░░\n"
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);
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}
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}
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auto Main(std::istream & in) -> void
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{
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auto const snapshots {Execute(in)};
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std::cout << "Part 1: " << Part1(snapshots) << std::endl;
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Part2(snapshots, std::cout << "Part 2:\n");
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}
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