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Day11.cs
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Day11.cs
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public class Day11
{
public static async Task<string> Part1Async(bool example = false)
{
var data = await ParseInput(example);
int flashCount = 0;
for (int step = 0; step < 100; step++)
{
for (int x = 0; x < data.Length; x++)
for (int y = 0; y < data[x].Length; y++)
{
flashCount += IncreaseAndFlash(data, x, y);
}
ResetEnergy(data);
}
return flashCount.ToString();
}
private static int IncreaseAndFlash(int[][] data, int x, int y)
{
int flashCount = 0;
if ((x < 0 || x >= data.Length) || (y < 0 || y >= data[x].Length))
return flashCount;
data[x][y]++;
if (data[x][y] == 10)
{
flashCount++;
flashCount += IncreaseAndFlash(data, x - 1, y - 1);
flashCount += IncreaseAndFlash(data, x - 1, y);
flashCount += IncreaseAndFlash(data, x - 1, y + 1);
flashCount += IncreaseAndFlash(data, x, y - 1);
flashCount += IncreaseAndFlash(data, x, y + 1);
flashCount += IncreaseAndFlash(data, x + 1, y - 1);
flashCount += IncreaseAndFlash(data, x + 1, y);
flashCount += IncreaseAndFlash(data, x + 1, y + 1);
}
return flashCount;
}
private static void ResetEnergy(int[][] data)
{
for (int x = 0; x < data.Length; x++)
{
for (int y = 0; y < data[x].Length; y++)
{
if (data[x][y] >= 10)
data[x][y] = 0;
}
}
}
public static async Task<string> Part2Async(bool example = false)
{
var data = await ParseInput(example);
int flashCount = 0;
var step = 0;
while (true)
{
for (int x = 0; x < data.Length; x++)
for (int y = 0; y < data[x].Length; y++)
{
flashCount += IncreaseAndFlash(data, x, y);
}
ResetEnergy(data);
if (data.All(d => d.All(n => n == 0))) return (step + 1).ToString();
step++;
}
}
private static async Task<int[][]> ParseInput(bool example)
{
var input = await File.ReadAllLinesAsync($"inputs/day11{(example ? ".example" : string.Empty)}.txt");
var data = input.Select(line => line.Select(ch => int.Parse(ch.ToString())).ToArray()).ToArray();
return data;
}
}