81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
#include <cstdint>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include <vector>
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#include <tuple>
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#include <doctest.h>
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#include <aocpp/Startup.hpp>
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using namespace aocpp;
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namespace {
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struct Scanner {
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std::uint64_t depth, range, position, length;
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};
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auto Parse(std::istream & in)
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-> std::vector<Scanner>
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{
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std::uint64_t depth, range;
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char skip;
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std::vector<Scanner> result;
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while (in >> depth >> skip >> range) {
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auto len = range*2-2;
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result.push_back(Scanner{depth, range, depth%len, len});
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}
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return result;
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}
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auto Caught(std::vector<Scanner> const& scanners) -> std::size_t {
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std::uint64_t severity = 0;
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for (auto const& scanner : scanners) {
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if (scanner.position == 0) {
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severity += scanner.depth * scanner.range;
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}
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}
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return severity;
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}
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auto Delay(std::vector<Scanner> scanners) {
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std::uint64_t delay = 0;
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for (;;) {
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bool success = true;
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for (auto & scanner : scanners) {
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if (scanner.position++ == 0) { success = false; }
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if (scanner.position == scanner.length) scanner.position = 0;
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}
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if (success) break;
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delay++;
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}
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return delay;
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}
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} // namespace
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TEST_SUITE("2017-12 examples") {
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TEST_CASE("example") {
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std::istringstream in {
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"0: 3\n"
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"1: 2\n"
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"4: 4\n"
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"6: 4\n"
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};
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auto input = Parse(in);
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CHECK(Caught(input) == 24);
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CHECK(Delay(input) == 10);
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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 input {Parse(in)};
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std::cout << "Part 1: " << Caught(input) << std::endl;
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std::cout << "Part 2: " << Delay(std::move(input)) << std::endl;
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}
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