72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
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#include <aocpp/Startup.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <doctest.h>
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#include <algorithm>
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#include <array>
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#include <functional>
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#include <numeric>
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struct Box
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{
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std::int64_t x;
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std::int64_t y;
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std::int64_t z;
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};
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auto Part1(Box const& box) -> std::int64_t
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{
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std::array<std::int64_t, 3> sides {box.x * box.y, box.x * box.z, box.y * box.z};
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std::partial_sort(begin(sides), begin(sides)+1, end(sides));
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return 2 * std::reduce(begin(sides), end(sides)) + sides[0];
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}
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auto Part2(Box const& box) -> std::int64_t
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{
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std::array<std::int64_t, 3> dims {box.x, box.y, box.z};
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std::sort(begin(dims), end(dims));
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return 2 * (dims[0] + dims[1]) + std::reduce(begin(dims), end(dims), 1, std::multiplies<>());
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}
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TEST_SUITE("documented examples") {
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TEST_CASE("part 1") {
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REQUIRE(Part1({2,3,4}) == 58);
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REQUIRE(Part1({1,1,10}) == 43);
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}
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TEST_CASE("part 2") {
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REQUIRE(Part2({2,3,4}) == 34);
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REQUIRE(Part2({1,1,10}) == 14);
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}
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}
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auto Main(std::istream & in, std::ostream & out) -> void
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{
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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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namespace qi = boost::spirit::qi;
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using p = qi::int_parser<std::int64_t>;
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auto b = begin(line); // updated on successful parse
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auto const e = end(line);
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Box box;
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if (not qi::parse(b, e, p{} >> 'x' >> p{} >> 'x' >> p{}, box.x, box.y, box.z) || b != e)
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{
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throw std::runtime_error{"Parse error"};
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}
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part1 += Part1(box);
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part2 += Part2(box);
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}
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std::cout << "Part1: " << part1 << std::endl;
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std::cout << "Part2: " << part2 << std::endl;
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}
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