100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
#include <algorithm>
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#include <cctype>
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#include <cstdint>
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#include <cstdlib>
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#include <functional>
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#include <iostream>
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#include <map>
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#include <tuple>
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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 Eval(
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std::string const& input,
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std::map<char, std::pair<int, std::function<std::int64_t(std::int64_t,std::int64_t)>>> cfg
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) -> std::int64_t
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{
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std::vector<char> ops;
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std::vector<std::int64_t> vals;
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auto const eval1 = [&](){
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char o = ops.back(); ops.pop_back();
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std::int64_t y = vals.back(); vals.pop_back();
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std::int64_t x = vals.back(); vals.pop_back();
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vals.push_back(cfg[o].second(x,y));
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};
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for (auto it = input.begin(); it != input.end(); it++) {
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char const c = *it;
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if (c == ' ') continue;
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if (std::isdigit(c)) {
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vals.push_back(c - '0');
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} else if ('(' == c) {
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ops.push_back('(');
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} else if (')' == c) {
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while (ops.back() != '(') eval1();
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ops.pop_back();
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} else if (auto opit = cfg.find(c); opit != cfg.end()) {
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while (!ops.empty() && cfg[ops.back()].first >= opit->second.first) eval1();
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ops.push_back(c);
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}
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}
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while (!ops.empty()) eval1();
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return vals.back();
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}
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auto Part1(std::string const& line) {
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return Eval(line, {{'+', {1, std::plus<std::int64_t>()}},{'*', {1, std::multiplies<std::int64_t>()}}});
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}
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auto Part2(std::string const& line) {
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return Eval(line, {{'+', {2, std::plus<std::int64_t>()}},{'*', {1, std::multiplies<std::int64_t>()}}});
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}
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} // namespace
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TEST_SUITE("documented examples") {
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TEST_CASE("part 1") {
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REQUIRE(Part1("1 + 2 * 3 + 4 * 5 + 6") == 71);
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REQUIRE(Part1("1 + (2 * 3) + (4 * (5 + 6))") == 51);
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REQUIRE(Part1("2 * 3 + (4 * 5)") == 26);
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REQUIRE(Part1("5 + (8 * 3 + 9 + 3 * 4 * 3)") == 437);
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REQUIRE(Part1("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))") == 12240);
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REQUIRE(Part1("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2") == 13632);
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}
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TEST_CASE("part 2") {
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REQUIRE(Part2("1 + 2 * 3 + 4 * 5 + 6") == 231);
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REQUIRE(Part2("1 + (2 * 3) + (4 * (5 + 6))") == 51);
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REQUIRE(Part2("2 * 3 + (4 * 5)") == 46);
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REQUIRE(Part2("5 + (8 * 3 + 9 + 3 * 4 * 3)") == 1445);
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REQUIRE(Part2("5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))") == 669060);
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REQUIRE(Part2("((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2") == 23340);
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}
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}
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auto main(int argc, char** argv) -> int {
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auto & in = aocpp::Startup(argc, argv);
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std::int64_t part1 = 0;
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std::int64_t part2 = 0;
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std::string line;
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while (std::getline(in, line)) {
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part1 += Part1(line);
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part2 += Part2(line);
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}
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std::cout << "Part 1: " << part1 << std::endl;
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std::cout << "Part 2: " << part2 << std::endl;
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}
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