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+#...#.......#.#.#.#.#.#...#.......#.#.#...#.###.#...#.#.#.#.#.#.#.#.#.#.#...#.#.#.#...#...#.#.#.#.#...#.......#...#...#...#...#.........#.#.# +#.#########.#.#.#.#.#.###.#.#######.#.#.#.#.###.#.###.#.#.#.#.#.#.#.#.#.###.#.#.#.###.#.###.#.#.#.#.#########.###.#.#####.#.###.#########.#.# +#...........#...#...#.....#.........#...#...###...###...#...#...#...#...###...#...###...###...#...#...........###...#####...###...........#.# +###########################################################################################################################################.# \ No newline at end of file diff --git a/inputs/23a.txt b/inputs/23a.txt new file mode 100644 index 0000000..65c7c3d --- /dev/null +++ b/inputs/23a.txt @@ -0,0 +1,23 @@ +#.##################### +#.......#########...### +#######.#########.#.### +###.....#.>.>.###.#.### +###v#####.#v#.###.#.### +###.>...#.#.#.....#...# +###v###.#.#.#########.# +###...#.#.#.......#...# +#####.#.#.#######.#.### +#.....#.#.#.......#...# +#.#####.#.#.#########v# +#.#...#...#...###...>.# +#.#.#v#######v###.###v# +#...#.>.#...>.>.#.###.# +#####v#.#.###v#.#.###.# +#.....#...#...#.#.#...# +#.#########.###.#.#.### +#...###...#...#...#.### +###.###.#.###v#####v### +#...#...#.#.>.>.#.>.### +#.###.###.#.###.#.#v### +#.....###...###...#...# +#####################.# \ No newline at end of file diff --git a/src/23.cs b/src/23.cs new file mode 100644 index 0000000..25ea77e --- /dev/null +++ b/src/23.cs @@ -0,0 +1,251 @@ +using aoc2023.Util; + +namespace aoc2023; + +internal class Day23 : Day +{ + private IEnumerable GetNeighbors(ivec2 pos, bool oneWaySlopes = true) + { + if (grid[pos] != null && oneWaySlopes) + { + yield return (pos + grid[pos]!).Value; + } + else + { + foreach (var p in pos.GetOrthogonalNeighbors()) + { + if (grid.ContainsKey(p)) + { + yield return p; + } + } + } + } + + private int width; + private int height; + private readonly Dictionary grid = []; + private ivec2 start = ivec2.ZERO; + private ivec2 end = ivec2.ZERO; + + internal override void Parse() + { + var lines = Parsing.ReadAllLines($"{GetDay()}").ToList(); + height = lines.Count; + for (int row = 0; row < height; row++) + { + width = lines[row].Length; + for (int col = 0; col < width; col++) + { + if (lines[row][col] == '#') + { + continue; + } + + if (lines[row][col] == '.') + { + var pt = new ivec2(col, row); + grid.Add(pt, null); + if (row == 0) + { + start = pt; + } + else if (row == height - 1) + { + end = pt; + } + continue; + } + + grid.Add(new ivec2(col, row), lines[row][col] switch + { + '>' => ivec2.RIGHT, + '<' => ivec2.LEFT, + '^' => ivec2.UP, + 'v' => ivec2.DOWN, + _ => throw new Exception(), + }); + } + } + } + + private void Render(Dictionary<(ivec2, ivec2), int> visited) + { + for (int row = 0; row < height; row++) + { + for (int col = 0; col < width; col++) + { + var pt = new ivec2(col, row); + if (!grid.ContainsKey(pt)) + { + Logger.Log(Constants.SolidBlock.ToString()); + continue; + } + + bool skip = false; + foreach (var v in visited) + { + if (v.Key.Item1 == pt) + { + Logger.Log("O"); + skip = true; + break; + } + } + + if (skip) + { + continue; + } + + if (grid[pt] == null) + { + Logger.Log(" "); + continue; + } + + if (grid[pt] == ivec2.RIGHT) + { + Logger.Log(">"); + } + if (grid[pt] == ivec2.DOWN) + { + Logger.Log("v"); + } + if (grid[pt] == ivec2.UP) + { + Logger.Log("^"); + } + if (grid[pt] == ivec2.LEFT) + { + Logger.Log("<"); + } + } + Logger.LogLine(""); + } + } + + int GetLongestDistanceFrom(Dictionary> graph, ivec2 pt, HashSet seen) + { + if (pt == end) + { + return 0; + } + + var m = int.MinValue; + seen.Add(pt); + foreach (var pos in graph[pt]) + { + if (!seen.Contains(pos.Item1)) + { + m = System.Math.Max(m, GetLongestDistanceFrom(graph, pos.Item1, seen) + pos.Item2); + } + } + + seen.Remove(pt); + + return m; + } + + internal override string Part1() + { + Dictionary> graph = []; + + HashSet forks = [start, end]; + foreach (var pt in grid) + { + if (GetNeighbors(pt.Key).Count() >= 3) + { + forks.Add(pt.Key); + graph.Add(pt.Key, []); + } + } + + HashSet seen = []; + foreach (var forkPoint in forks) + { + Stack<(ivec2, int)> s = []; + s.Push((forkPoint, 0)); + seen.Clear(); + seen.Add(forkPoint); + + while (s.TryPop(out (ivec2 pos, int cost) next)) + { + if (next.cost != 0 && forks.Contains(next.pos)) + { + graph.TryAdd(forkPoint, []); + graph[forkPoint].Add((next.pos, next.cost)); + continue; + } + + foreach (var neighbor in GetNeighbors(next.pos)) + { + if (seen.Contains(neighbor)) + { + continue; + } + + s.Push((neighbor, next.cost + 1)); + seen.Add(neighbor); + } + } + } + + seen.Clear(); + int dist = GetLongestDistanceFrom(graph, start, seen); + + // Render(); + + return $"<+white>{dist}"; + } + + internal override string Part2() + { + Dictionary> graph = []; + + HashSet forks = [start, end]; + foreach (var pt in grid) + { + if (GetNeighbors(pt.Key, false).Count() >= 3) + { + forks.Add(pt.Key); + graph.Add(pt.Key, []); + } + } + + HashSet seen = []; + foreach (var forkPoint in forks) + { + Stack<(ivec2, int)> s = []; + s.Push((forkPoint, 0)); + seen.Clear(); + seen.Add(forkPoint); + + while (s.TryPop(out (ivec2 pos, int cost) next)) + { + if (next.cost != 0 && forks.Contains(next.pos)) + { + graph.TryAdd(forkPoint, []); + graph[forkPoint].Add((next.pos, next.cost)); + continue; + } + + foreach (var neighbor in GetNeighbors(next.pos, false)) + { + if (seen.Contains(neighbor)) + { + continue; + } + + s.Push((neighbor, next.cost + 1)); + seen.Add(neighbor); + } + } + } + + seen.Clear(); + int dist = GetLongestDistanceFrom(graph, start, seen); + + return $"<+white>{dist}"; + } +}