104 lines
3.5 KiB
C#
104 lines
3.5 KiB
C#
namespace AOC2015;
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/// <summary>
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/// Day 6: <a href="https://adventofcode.com/2015/day/6"/>
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/// </summary>
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public sealed partial class Day06() : Day(2015, 6, "Probably a Fire Hazard")
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{
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private readonly Dictionary<(int x, int y), int> _brightnessGrid = [];
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private readonly Dictionary<(int x, int y), bool> _lightGrid = [];
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[GeneratedRegex(@"(\d+),(\d+) through (\d+),(\d+)")]
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private static partial Regex Coords();
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public override object Part1()
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{
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foreach (var line in Input)
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{
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var d = Coords().Match(line).Groups.Values.Skip(1).Select(v => int.Parse(v.Value)).ToList();
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int x1 = d[0], y1 = d[1], x2 = d[2], y2 = d[3];
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int xStart = Math.Min(x1, x2), xEnd = Math.Max(x1, x2), yStart = Math.Min(y1, y2), yEnd = Math.Max(y1, y2);
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for (var x = xStart; x <= xEnd; x++)
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{
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for (var y = yStart; y <= yEnd; y++)
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{
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if (line.StartsWith("toggle"))
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{
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if (_lightGrid.ContainsKey((x, y)))
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{
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_lightGrid[(x, y)] = !_lightGrid[(x, y)];
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}
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else
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{
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_lightGrid[(x, y)] = true;
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}
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}
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else if (line.StartsWith("turn on"))
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{
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_lightGrid[(x, y)] = true;
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}
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else if (line.StartsWith("turn off"))
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{
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_lightGrid[(x, y)] = false;
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}
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}
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}
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}
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return _lightGrid.Count(v => v.Value);
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}
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public override object Part2()
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{
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foreach (var line in Input)
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{
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var d = Coords().Match(line).Groups.Values.Skip(1).Select(v => int.Parse(v.Value)).ToList();
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int x1 = d[0], y1 = d[1], x2 = d[2], y2 = d[3];
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int xStart = Math.Min(x1, x2), xEnd = Math.Max(x1, x2), yStart = Math.Min(y1, y2), yEnd = Math.Max(y1, y2);
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for (var x = xStart; x <= xEnd; x++)
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{
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for (var y = yStart; y <= yEnd; y++)
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{
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if (line.StartsWith("toggle"))
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{
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if (_brightnessGrid.ContainsKey((x, y)))
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{
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_brightnessGrid[(x, y)] += 2;
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}
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else
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{
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_brightnessGrid[(x, y)] = 2;
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}
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}
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else if (line.StartsWith("turn on"))
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{
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if (_brightnessGrid.ContainsKey((x, y)))
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{
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_brightnessGrid[(x, y)]++;
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}
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else
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{
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_brightnessGrid[(x, y)] = 1;
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}
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}
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else if (line.StartsWith("turn off"))
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{
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if (_brightnessGrid.ContainsKey((x, y)) && _brightnessGrid[(x, y)] > 0)
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{
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_brightnessGrid[(x, y)]--;
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}
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else
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{
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_brightnessGrid[(x, y)] = 0;
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}
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}
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}
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}
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}
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return _brightnessGrid.Sum(v => v.Value);
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}
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}
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