Add day 20

Days/Day20.cs

@@ -0,0 +1,288 @@
+using System.Collections.Frozen;
+using System.Numerics;
+using System.Runtime.Intrinsics.X86;
+using Spectre.Console;
+
+namespace AdventOfCode.Days;
+
+public class Day20 : Day
+{
+    public override int Number => 20;
+    public override string Name => "Race Condition";
+
+    private const int Size = 141;
+    private const char Wall = '#';
+    private const char Empty = '.';
+
+    private readonly List<Point> _cheatOffsets =
+    [
+        (2, 0),
+        (1, 1),
+        (0, 2),
+        (-1, 1),
+        (-2, 0),
+        (-1, -1),
+        (0, -2),
+        (1, -1)
+    ];
+
+    public override void RunPart1(bool display = true)
+    {
+        var (map, start, end) = ParseMap();
+
+        // Find track path
+        var trackPath = new List<Point>();
+        var distanceFromStart = new Dictionary<Point, int>();
+
+        var position = start;
+
+        var distance = 0;
+        while (position != end)
+        {
+           trackPath.Add(position);
+           distanceFromStart[position] = distance;
+
+           // Find next track position
+           distance++;
+           var up = position + new Point(0, -1);
+           if (up is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[up.X, up.Y] is not Wall && !distanceFromStart.ContainsKey(up))
+           {
+               position = up;
+
+               continue;
+           }
+
+           var down = position + new Point(0, 1);
+           if (down is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[down.X, down.Y] is not Wall && !distanceFromStart.ContainsKey(down))
+           {
+               position = down;
+
+               continue;
+           }
+
+           var left = position + new Point(-1, 0);
+           if (left is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[left.X, left.Y] is not Wall && !distanceFromStart.ContainsKey(left))
+           {
+               position = left;
+
+               continue;
+           }
+
+           var right = position + new Point(1, 0);
+           if (right is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[right.X, right.Y] is not Wall && !distanceFromStart.ContainsKey(right))
+           {
+               position = right;
+           }
+        }
+
+        // Also add end
+        trackPath.Add(position);
+        distanceFromStart[position] = distance;
+
+        var cheats = new Dictionary<(Point StartPosition, Point EndPosition), int>();
+
+        // Now return to start and try all possible combination of cheats for each track position
+        foreach (var trackPosition in trackPath)
+        {
+            var originDistance = distanceFromStart[trackPosition];
+
+            foreach (var cheatOffset in _cheatOffsets)
+            {
+                var cheatDestination = trackPosition + cheatOffset;
+
+                if (cheatDestination.X is < 0 or >= Size || cheatDestination.Y is < 0 or >= Size)
+                {
+                    continue;
+                }
+
+                if (map[cheatDestination.X, cheatDestination.Y] is Wall)
+                {
+                    continue;
+                }
+
+                var destinationDistance = distanceFromStart[cheatDestination];
+                var savedDistance = destinationDistance - originDistance - 2;
+
+                // Only take into account real shortcuts, not those that do not save time
+                if (savedDistance < 1)
+                {
+                    continue;
+                }
+
+                cheats.Add((trackPosition, cheatDestination), savedDistance);
+            }
+        }
+
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]Number of cheats that save at least 100 picoseconds: [yellow]{cheats.Count(c => c.Value >= 100)}[/][/]");
+        }
+    }
+
+    public override void RunPart2(bool display = true)
+    {
+        var (map, start, end) = ParseMap();
+
+        // Find track path
+        var trackPath = new List<Point>();
+        var distanceFromStart = new Dictionary<Point, int>();
+
+        var position = start;
+
+        var distance = 0;
+        while (position != end)
+        {
+           trackPath.Add(position);
+           distanceFromStart[position] = distance;
+
+           // Find next track position
+           distance++;
+           var up = position + new Point(0, -1);
+           if (up is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[up.X, up.Y] is not Wall && !distanceFromStart.ContainsKey(up))
+           {
+               position = up;
+
+               continue;
+           }
+
+           var down = position + new Point(0, 1);
+           if (down is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[down.X, down.Y] is not Wall && !distanceFromStart.ContainsKey(down))
+           {
+               position = down;
+
+               continue;
+           }
+
+           var left = position + new Point(-1, 0);
+           if (left is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[left.X, left.Y] is not Wall && !distanceFromStart.ContainsKey(left))
+           {
+               position = left;
+
+               continue;
+           }
+
+           var right = position + new Point(1, 0);
+           if (right is { X: >= 0 and < Size, Y: >= 0 and < Size } && map[right.X, right.Y] is not Wall && !distanceFromStart.ContainsKey(right))
+           {
+               position = right;
+           }
+        }
+
+        // Also add end
+        trackPath.Add(position);
+        distanceFromStart[position] = distance;
+
+        var cheats = new Dictionary<(Point StartPosition, Point EndPosition), int>();
+
+        // Now return to start and try all possible combination of cheats for each track position
+        foreach (var trackPosition in trackPath)
+        {
+            var originDistance = distanceFromStart[trackPosition];
+
+            foreach (var cheatDestination in trackPath.Where(destination => trackPosition.DistanceTo(destination) <= 20))
+            {
+                var cheatLength = trackPosition.DistanceTo(cheatDestination);
+
+                var destinationDistance = distanceFromStart[cheatDestination];
+                var savedDistance = destinationDistance - originDistance - cheatLength;
+
+                // Only take into account real shortcuts, not those that do not save time
+                if (savedDistance < 1)
+                {
+                    continue;
+                }
+
+                if (cheats.TryGetValue((trackPosition, cheatDestination), out var otherSavedDistance))
+                {
+                    if (savedDistance <= otherSavedDistance)
+                    {
+                        continue;
+                    }
+                }
+
+                cheats[(trackPosition, cheatDestination)] = savedDistance;
+            }
+        }
+
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]Number of cheats that save at least 100 picoseconds: [yellow]{cheats.Count(c => c.Value >= 100)}[/][/]");
+        }
+    }
+
+    private (char[,] Map, Point Start, Point End) ParseMap()
+    {
+        var map = new char[Size, Size];
+        Point start = default;
+        Point end = default;
+
+        var y = 0;
+        foreach (var line in Input.AsSpan().EnumerateLines())
+        {
+            var x = 0;
+
+            foreach (var symbol in line)
+            {
+                if (symbol == 'S')
+                {
+                    start = new Point(x, y);
+                }
+                else if (symbol == 'E')
+                {
+                    end = new Point(x, y);
+                }
+
+                if (symbol is Wall)
+                {
+                    map[x, y] = Wall;
+                }
+                else
+                {
+                    map[x, y] = Empty;
+                }
+
+                x++;
+            }
+
+            y++;
+        }
+
+        return (map, start, end);
+    }
+
+    private readonly record struct Point(int X, int Y)
+        : IAdditionOperators<Point, Point, Point>,
+            ISubtractionOperators<Point, Point, Point>,
+            IMultiplyOperators<Point, int, Point>
+    {
+        public static Point operator +(Point left, Point right)
+        {
+            return new Point(left.X + right.X, left.Y + right.Y);
+        }
+
+        public static Point operator -(Point left, Point right)
+        {
+            return new Point(left.X - right.X, left.Y - right.Y);
+        }
+
+        public static Point operator *(Point left, int right)
+        {
+            return new Point(left.X * right, left.Y * right);
+        }
+
+        public static Point operator *(int left, Point right)
+        {
+            return new Point(right.X * left, right.Y * left);
+        }
+
+        public static implicit operator Point((int X, int Y) point)
+            => new(point.X, point.Y);
+
+        public int DistanceTo(Point other)
+        {
+            var distance = other - this;
+
+            return Math.Abs(distance.X) + Math.Abs(distance.Y);
+        }
+    }
+}

Inputs/Day20.txt

@@ -0,0 +1,141 @@
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