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private int width; + private int height; + internal override void Parse() + { + var lines = Parsing.ReadAllLines($"{GetDay()}").ToList(); + platform = new char[lines[0].Length, lines.Count]; + for (int row = 0; row < lines.Count; row++) + { + for (int col = 0; col < lines[row].Length; col++) + { + platform[col, row] = lines[row][col]; + width = col + 1; + } + + height = row + 1; + } + } + + private void Render(char[,] grid) + { + for (int i = 0; i < height; i++) + { + for (int j = 0; j < width; j++) + { + Logger.Log($"{grid[j,i]}"); + } + Logger.LogLine(""); + } + } + + private void Tilt(char[,] grid, ivec2 direction) + { + int initialX = 0; + int initialY = 0; + var xCond = (int v) => v < width; + var yCond = (int v) => v < height; + var xInc = (int x) => x + 1; + var yInc = (int y) => y + 1; + + if (direction.x > 0 || direction.y > 0) + { + initialX = width - 1; + initialY = height - 1; + xCond = v => v >= 0; + yCond = v => v >= 0; + xInc = x => x - 1; + yInc = y => y - 1; + } + + for (int row = initialY; yCond(row); row = yInc(row)) + { + for (int col = initialX; xCond(col); col = xInc(col)) + { + if (grid[col, row] != 'O') + { + continue; + } + + var next = new ivec2(col, row); + while (true) + { + next += direction; + if (next.x < 0 || next.y < 0 || next.x >= width || next.y >= height) + { + break; + } + + if (grid[next.x, next.y] != '.') + { + break; + } + + grid[next.x - direction.x, next.y - direction.y] = '.'; + grid[next.x, next.y] = 'O'; + } + } + } + } + + private long GetLoad(char[,] grid) + { + long total = 0; + for (int row = 0; row < height; row++) + { + int multiplier = height - row; + for (int col = 0; col < width; col++) + { + if (grid[col, row] == 'O') + { + total += multiplier; + } + } + } + + return total; + } + + private string Stringify(char[,] grid) + { + StringBuilder sb = new(width * height); + for (int row = 0; row < height; row++) + { + for (int col = 0; col < width; col++) + { + sb.Append(grid[col, row]); + } + } + + return sb.ToString(); + } + + private char[,] Arrayify(string grid) + { + char[,] result = new char[width, height]; + for (int i = 0; i < height; i++) + { + for (int j = 0; j < width; j++) + { + result[j, i] = grid[(i * height) + j]; + } + } + + return result; + } + + internal override string Part1() + { + char[,] part1 = new char[width, height]; + Array.Copy(platform, part1, width * height); + + Tilt(part1, new ivec2(0, -1)); + + long total = GetLoad(part1); + + return $"Load on north support beam: <+white>{total}"; + } + + internal override string Part2() + { + char[,] part2 = new char[width, height]; + Array.Copy(platform, part2, width * height); + + List seen = []; + + var northDir = new ivec2(0, -1); + var eastDir = new ivec2(1, 0); + var southDir = new ivec2(0, 1); + var westDir = new ivec2(-1, 0); + long loopCycle = 0; + long cycle; + for (cycle = 0; cycle < 1000000000L; cycle++) + { + Tilt(part2, northDir); + Tilt(part2, westDir); + Tilt(part2, southDir); + Tilt(part2, eastDir); + + var result = Stringify(part2); + if (seen.Count(g => g == result) == 2) + { + int periodStart = seen.FindIndex(g => g == result); + int periodLen = seen.Skip(periodStart + 1).ToList().FindIndex(g => g == result) + 1; + loopCycle = ((1000000000L - periodStart) % periodLen) + periodStart; + break; + } + seen.Add(result); + } + + var finalGrid = Arrayify(seen[(int)loopCycle - 1]); + var load = GetLoad(finalGrid); + return $"North load after 1000000000 (determined after {cycle + 1}) cycles would be: <+white>{load}"; + } +} diff --git a/src/Util/Extensions.cs b/src/Util/Extensions.cs index 52664d6..3cabe66 100644 --- a/src/Util/Extensions.cs +++ b/src/Util/Extensions.cs @@ -42,4 +42,8 @@ public static class Extensions { return str[..index] + replace + str[(index + 1)..]; } + + public static bool SequenceEquals(this T[,] a, T[,] b) => a.Rank == b.Rank + && Enumerable.Range(0, a.Rank).All(d=> a.GetLength(d) == b.GetLength(d)) + && a.Cast().SequenceEqual(b.Cast()); }