Day 20
This commit is contained in:
Stefan Forstenlechner
parent
3b6229c687
commit
e25f327812
2
Day19.cs
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Day19.cs
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#define Day19
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// #define Day19
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#if Day19
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using System.Collections.Immutable;
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using AoC2021;
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#define Day20
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#if Day20
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using AoC2021;
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var lines = File.ReadAllLines("day20/input");
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var translate = lines[0].Select(c => c == '#' ? "1" : "0").ToList();
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int steps = 50;
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int size = lines.Length - 2;
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string[,] image = new string[size + 4,size + 4];
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lines.Skip(2).ForEachIndex((l, row) =>
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l.ForEachIndex((c, col) => image[row + 2, col + 2] = c == '#' ? "1" : "0"));
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string infinite = "0";
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SetBorder(image, infinite);
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// Print(image);
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while (steps > 0) {
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size = image.GetLength(0);
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string[,] nextImage = new string[size + 2,size + 2];
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for (int row = 1; row < size-1; row++) {
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for (int col = 1; col < size-1; col++) {
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nextImage[row + 1, col + 1] = GetNewPoint(row, col, image);
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}
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}
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infinite = NextInfinite(infinite);
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SetBorder(nextImage, infinite);
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image = nextImage;
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// Print(image);
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// Console.WriteLine();
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steps--;
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}
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int count = 0;
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for (int row = 0; row < image.GetLength(0); row++) {
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for (int col = 0; col < image.GetLength(1); col++) {
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if (image[row, col] == "1") {
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count++;
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}
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}
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}
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Console.WriteLine(count);
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void Print(string[,] image) {
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for (int row = 0; row < image.GetLength(0); row++) {
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for (int col = 0; col < image.GetLength(1); col++) {
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Console.Write(image[row, col] == "1" ? '#' : '.');
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}
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Console.WriteLine();
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}
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}
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string GetNewPoint(int row, int col, string[,] imageToRead) {
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var binary = imageToRead[row - 1, col - 1] + imageToRead[row - 1, col] + imageToRead[row - 1, col + 1]
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+ imageToRead[row, col - 1] + imageToRead[row, col] + imageToRead[row, col + 1]
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+ imageToRead[row + 1, col - 1] + imageToRead[row + 1, col] + imageToRead[row + 1, col + 1];
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return translate[Convert.ToInt32(binary, 2)];
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}
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string NextInfinite(string infinite) {
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var infinitePos = Convert.ToInt32(String.Join("",Enumerable.Repeat(infinite, 9)), 2);
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return translate[infinitePos];
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}
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void SetBorder(string[,] image, string value) {
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int last = image.GetLength(0) - 1;
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Enumerable.Range(0, image.GetLength(0)).ForEachAsList(i => {
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image[0, i] = value;
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image[1, i] = value;
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image[i, 0] = value;
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image[i, 1] = value;
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image[last, i] = value;
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image[last-1, i] = value;
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image[i, last] = value;
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image[i, last-1] = value;
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});
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}
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#endif
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