Day 18 part 1

Day18/Field.cs

@@ -0,0 +1,143 @@
+using System.Drawing;
+
+using Day17;
+
+namespace Day18;
+
+public class Field
+{
+    private int _minX, _maxX = 0;
+    private int _minY, _maxY = 0;
+    private Vec _pos = new Vec(0, 0);
+    private readonly Dictionary<Vec, CellData> _grid = new Dictionary<Vec, CellData>();
+
+    public Field()
+    {
+        _grid[_pos] = new CellData(Color.White);
+    }
+
+    public void Apply(Instruction inst)
+    {
+        var v = Vec.Direction(inst.Dir);
+        for (var i = 0; i < inst.Num; i++)
+        {
+            _grid[_pos].Outgoing = v;
+            
+            _pos = _pos.Add(v);
+            _grid.TryAdd(_pos, new CellData(inst.Color));
+            _grid[_pos].Incoming = v;
+            
+            _minX = Math.Min(_minX, _pos.X);
+            _maxX = Math.Max(_maxX, _pos.X);
+            _minY = Math.Min(_minY, _pos.Y);
+            _maxY = Math.Max(_maxY, _pos.Y);
+        }
+    }
+
+    public int Fill()
+    {
+        var count = 0;
+        for (var y = _minY; y < _maxY + 1; y++)
+        {
+            var lastCorner = 0;
+            var transitions = 0;
+            for (var x = _minX; x < _maxX + 1; x++)
+            {
+                var v = new Vec(x, y);
+                if (_grid.TryGetValue(v, out CellData? d))
+                {
+                    var data = d!;
+                    count++;
+                    var cornerNum = data.CornerNum();
+                    if (cornerNum == 0)
+                    {
+                        if (data.Incoming!.Value.IsVertical)
+                        {
+                            transitions++;
+                        }
+                    }
+                    else
+                    {
+                        if (lastCorner == 0)
+                        {
+                            lastCorner = cornerNum;
+                        }
+                        else if (lastCorner == -cornerNum)
+                        {
+                            transitions++;
+                            lastCorner = 0;
+                        }
+                        else
+                        {
+                            lastCorner = 0;
+                        }
+                    }
+                }
+                else
+                {
+                    if (transitions % 2 == 1)
+                    {
+                        count++;
+                    }
+                }
+            }
+        }
+
+        return count;
+    }
+
+    private int CornerNum(Vec vec)
+    {
+        var above = _grid.ContainsKey(vec.Add(new Vec(0, -1)));
+        var below = _grid.ContainsKey(vec.Add(new Vec(0, 1)));
+        return above == below
+            ? 0
+            : above
+                ? -1
+                : 1;
+    }
+
+    public void Print()
+    {
+        for (var y = _minY; y < _maxY + 1; y++)
+        {
+            for (var x = _minX; x < _maxX + 1; x++)
+            {
+                if (_grid.ContainsKey(new Vec(x, y)))
+                {
+                    Console.Write('#');
+                }
+                else
+                {
+                    Console.Write('.');
+                }
+            }
+
+            Console.WriteLine();
+        }
+
+        Console.WriteLine();
+    }
+
+    private class CellData
+    {
+        public Color Color { get; }
+        public Vec? Outgoing { get; set; }
+        public Vec? Incoming { get; set; }
+
+        public CellData(Color color)
+        {
+            Color = color;
+        }
+
+        public int CornerNum()
+        {
+            if (Incoming != null && Outgoing != null)
+            {
+                var n = Incoming.Value.Cross(Outgoing.Value);
+                return Math.Abs(n) == 1 ? n : 0;
+            }
+            return 0;
+        }
+    }
+}

Day18/Instruction.cs

@@ -0,0 +1,5 @@
+using System.Drawing;
+
+namespace Day18;
+
+public record Instruction(char Dir, int Num, Color Color);

Day18/Parser.cs

@@ -1,19 +1,31 @@
-using System.Text.RegularExpressions;
+using System.Drawing;
+using System.Text.RegularExpressions;
 
 namespace Day18;
 
 public partial class Parser
 {
-    [GeneratedRegex(@".*")]
+    [GeneratedRegex(@"([UDLR])\s+(\d+)\s+\((.*)\)")]
     private partial Regex LineMatch();
     
-    public void Parse(string inputFile)
+    public IEnumerable<Instruction> Parse(string inputFile)
     {
         using var reader = File.OpenText(inputFile);
+        var colorConverter = new ColorConverter();
         
         while (!reader.EndOfStream)
         {
             var line = reader.ReadLine()!;
+            var match = LineMatch().Match(line);
+            if (!match.Success)
+            {
+                throw new Exception($"Invalid instruction: {line}");
+            }
+
+            yield return new Instruction(
+                match.Groups[1].Value[0],
+                int.Parse(match.Groups[2].Value),
+                (Color)colorConverter.ConvertFromString(match.Groups[3].Value)!);
         }
     }
 }

Day18/Program.cs

@@ -16,5 +16,17 @@ if (args.Length < 1)
 
 var inputFile = args[0];
 var parser = new Parser();
+var instructions = parser.Parse(inputFile).ToList();
+var field = new Field();
+
+foreach (var i in instructions)
+{
+    Console.WriteLine($"{i.Dir}: {i.Num}");
+    field.Apply(i);
+}
+field.Print();
+var volume = field.Fill();
+Console.WriteLine();
+Console.WriteLine($"Volume: {volume}");
 
 return 0;

Day18/Vec.cs

@@ -0,0 +1,55 @@
+namespace Day17;
+
+public record struct Vec
+{
+    public int X { get; }
+    public int Y { get; }
+
+    public bool IsHorizontal => Y == 0;
+    public bool IsVertical => X == 0;
+
+    public Vec(int x, int y)
+    {
+        X = x;
+        Y = y;
+    }
+
+    public Vec RotatePositive()
+    {
+        // clockwise
+        return new Vec(-1 * Y, X);
+    }
+    
+    public Vec RotateNegative()
+    {
+        // counter-clockwise
+        return new Vec(Y, -1 * X);
+    }
+
+    public Vec Add(Vec other)
+    {
+        return new Vec(X + other.X, Y + other.Y);
+    }
+
+    public int Cross(Vec other)
+    {
+        return X * other.Y - other.X * Y;
+    }
+
+    public static Vec Direction(char c)
+    {
+        switch (c)
+        {
+            case 'R':
+                return new Vec(1, 0);
+            case 'L':
+                return new Vec(-1, 0);
+            case 'U':
+                return new Vec(0, -1);
+            case 'D':
+                return new Vec(0, 1);
+        }
+
+        return default;
+    }
+}

Day18/inputs/input-lar.txt

@@ -0,0 +1,604 @@
+R 2 (#3e6b80)
+U 6 (#2b1de3)
+R 4 (#1465b0)
+U 2 (#549d23)
+R 6 (#aa9992)
+U 6 (#27e7f3)
+R 7 (#aa9990)
+U 6 (#5a3933)
+R 5 (#1465b2)
+U 5 (#23ade3)
+R 4 (#49b5b2)
+U 6 (#39ad53)
+R 7 (#54c4f2)
+U 5 (#491513)
+R 9 (#4f5960)
+U 5 (#357be3)
+R 3 (#4f2140)
+U 6 (#258b43)
+R 4 (#4f9570)
+U 3 (#1ea371)
+R 8 (#7be6c0)
+U 5 (#67bd61)
+R 5 (#a31240)
+U 6 (#6bf7d1)
+R 5 (#a31242)
+U 4 (#3464a1)
+R 3 (#7be6c2)
+U 4 (#33f091)
+R 5 (#5c0530)
+U 6 (#4c4e11)
+R 2 (#611e90)
+U 3 (#128231)
+R 6 (#5ecef2)
+D 9 (#6eb251)
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+R 3 (#73a8b0)
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+D 7 (#750063)
+R 5 (#5e71f2)
+D 9 (#3358d3)
+L 6 (#1d2652)
+D 4 (#6a8ee3)
+L 3 (#4e9cd2)
+U 6 (#3e8623)
+L 2 (#3607d2)
+U 5 (#379d43)
+L 6 (#3cf342)
+U 3 (#853b63)
+L 3 (#737102)
+D 3 (#1de1b3)
+L 2 (#66ff82)
+D 10 (#634163)
+L 3 (#2eff02)
+U 6 (#2ac343)
+L 2 (#528a42)
+U 7 (#4d81d3)
+L 3 (#2ea1e2)
+D 5 (#19e063)
+L 6 (#8b5a82)
+D 7 (#4b8e33)
+L 4 (#5e41d0)
+D 2 (#159903)
+L 5 (#31f3c0)
+D 9 (#537013)
+L 2 (#31f3c2)
+D 7 (#4b7b43)
+L 4 (#5bd890)
+D 10 (#1be163)
+L 5 (#0c3340)
+D 3 (#540d83)
+L 9 (#2449f0)
+U 6 (#9411c1)
+L 7 (#766db0)
+U 7 (#9411c3)
+L 4 (#37ee30)
+D 3 (#516ad3)
+L 3 (#0991b0)
+D 2 (#98a733)
+L 5 (#0ea042)
+D 3 (#513f83)
+L 2 (#a0c682)
+D 8 (#616323)
+L 4 (#a0c680)
+D 3 (#4555b3)
+L 3 (#79e032)
+U 9 (#673de3)
+L 4 (#5904b0)
+U 7 (#495bd3)
+L 3 (#5904b2)
+U 2 (#49a633)
+L 5 (#76a9c2)
+U 10 (#10de23)

Day18/inputs/sample1.txt

@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)