72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#include <algorithm>
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#include <cstdint>
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#include <iostream>
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#include <tuple>
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#include <cstdio>
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#include <cstdlib>
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#include <doctest.h>
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#include <aocpp/Startup.hpp>
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namespace {
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using Entry = std::tuple<std::size_t, std::size_t, char, std::string>;
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auto Parse(std::string const& str) -> Entry
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{
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std::size_t lo, hi, n;
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char letter;
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auto res = std::sscanf(str.c_str(), "%zu-%zu %c: %zn", &lo, &hi, &letter, &n);
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if (res != 3) { throw std::runtime_error{"bad input"}; }
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return {lo, hi, letter, str.substr(n)};
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}
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auto Part1(Entry const& entry) -> bool {
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auto const& [lo, hi, letter, text] = entry;
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auto n = std::count(text.begin(), text.end(), letter);
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return lo <= n && n <= hi;
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}
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auto Part2(Entry const& entry) -> bool
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{
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auto const& [lo, hi, letter, text] = entry;
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return (text.at(lo-1) == letter) != (text.at(hi-1) == letter);
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}
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} // namespace
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TEST_SUITE("documented examples") {
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TEST_CASE("parser") {
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REQUIRE(Parse("1-3 z: example") == Entry{1,3,'z',"example"});
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}
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TEST_CASE("part 1") {
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REQUIRE( Part1(Parse("1-3 a: abcde")));
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REQUIRE(!Part1(Parse("1-3 b: cdefg")));
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REQUIRE( Part1(Parse("2-9 c: ccccccccc")));
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}
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TEST_CASE("part 2") {
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REQUIRE( Part2(Parse("1-3 a: abcde")));
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REQUIRE(!Part2(Parse("1-3 b: cdefg")));
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REQUIRE(!Part2(Parse("2-9 c: ccccccccc")));
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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::uint64_t part1{}, part2{};
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std::string line;
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while (std::getline(in, line)) {
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auto entry = Parse(line);
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if (Part1(entry)) part1++;
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if (Part2(entry)) part2++;
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}
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out << "Part 1: " << part1 << std::endl;
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out << "Part 2: " << part2 << std::endl;
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}
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