71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
#include <array>
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#include <bit>
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#include <cstdint>
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#include <iostream>
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#include <optional>
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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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#include <aocpp/Parsing.hpp>
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#include <aocpp/Hex.hpp>
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using namespace aocpp;
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namespace {
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auto Walk(std::string const& commands)
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-> std::pair<std::int64_t, std::int64_t>
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{
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Hex here {};
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std::int64_t part2 = 0;
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for (auto const& command : aocpp::SplitOn(commands, ",")) {
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here +=
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"n" == command ? HEX_N :
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"ne" == command ? HEX_NE :
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"nw" == command ? HEX_NW :
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"s" == command ? HEX_S :
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"se" == command ? HEX_SE :
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"sw" == command ? HEX_SW :
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throw std::runtime_error{"bad input"};
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part2 = std::max(part2, hex_distance(here));
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}
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return {hex_distance(here), part2};
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}
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} // namespace
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TEST_SUITE("2017-11 examples") {
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TEST_CASE("example 1") {
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auto [p1,p2] = Walk("ne,ne,ne");
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CHECK(p1 == 3);
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CHECK(p2 == 3);
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}
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TEST_CASE("example 2") {
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auto [p1,p2] = Walk("ne,ne,sw,sw");
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CHECK(p1 == 0);
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CHECK(p2 == 2);
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}
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TEST_CASE("example 3") {
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auto [p1,p2] = Walk("ne,ne,s,s");
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CHECK(p1 == 2);
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CHECK(p2 == 2);
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}
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TEST_CASE("example 4") {
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auto [p1,p2] = Walk("se,sw,se,sw,sw");
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CHECK(p1 == 3);
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CHECK(p2 == 3);
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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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std::string line;
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std::getline(in, line);
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auto const [part1, part2] = Walk(line);
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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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