28 lines
923 B
C#
28 lines
923 B
C#
namespace aoc2021;
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/// <summary>
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/// Day 5: <see href="https://adventofcode.com/2021/day/5"/>
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/// </summary>
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public sealed class Day05 : Day
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{
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public Day05() : base(5, "Hydrothermal Venture")
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{
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}
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private int Solve(bool diagonals = false) =>
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Input
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.Select(s => Regex.Split(s, @"\D+").Select(int.Parse).ToList())
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.Where(t => diagonals || t[0] == t[2] || t[1] == t[3])
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.SelectMany(t =>
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Enumerable.Range(0, Math.Max(Math.Abs(t[0] - t[2]), Math.Abs(t[1] - t[3])) + 1)
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.Select(i => (
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t[0] > t[2] ? t[2] + i : t[0] < t[2] ? t[2] - i : t[2],
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t[1] > t[3] ? t[3] + i : t[1] < t[3] ? t[3] - i : t[3])))
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.GroupBy(k => k)
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.Count(k => k.Count() > 1);
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public override object Part1() => Solve();
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public override object Part2() => Solve(diagonals: true);
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}
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