45 lines
1.3 KiB
C#
45 lines
1.3 KiB
C#
namespace AOC2015;
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/// <summary>
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/// Day 16: <a href="https://adventofcode.com/2015/day/16"/>
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/// </summary>
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public sealed partial class Day16() : Day(2015, 16, "Aunt Sue")
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{
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[GeneratedRegex(@": \d\d")]
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private static partial Regex TwoDigitsRegex();
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private IEnumerable<string> Common() =>
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Input
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.Select(i => TwoDigitsRegex().Replace(i, ": 9"))
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.WhereMatch("children: 3")
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.WhereMatch("samoyeds: 2")
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.WhereMatch("akitas: 0")
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.WhereMatch("vizslas: 0")
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.WhereMatch("cars: 2")
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.WhereMatch("perfumes: 1");
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public override object Part1() =>
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Common()
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.WhereMatch("cats: 7")
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.WhereMatch("trees: 3")
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.WhereMatch("pomeranians: 3")
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.WhereMatch("goldfish: 5")
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.Single()
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.Split(' ', ':')[1];
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public override object Part2() =>
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Common()
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.WhereMatch("cats: [89]")
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.WhereMatch("trees: [4-9]")
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.WhereMatch("pomeranians: [012]")
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.WhereMatch("goldfish: [0-4]")
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.Single()
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.Split(' ', ':')[1];
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}
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public static class Day16Extensions
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{
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public static IEnumerable<string> WhereMatch(this IEnumerable<string> input, string pattern) =>
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input.Where(i => !i.Contains(pattern.Split(' ')[0]) || Regex.IsMatch(i, pattern));
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}
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