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csharp/adventOfCode/day12/Day12.cs

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+namespace adventOfCode.day12;
+
+
+record Pin(int X, int Y);
+
+class Block
+{
+    private HashSet<Pin> Pins;
+
+    public Block(HashSet<Pin> pins)
+    {
+        Pins = pins;
+    }
+    
+    public static Block CreateBlock(string blockSection)
+    {
+        blockSection = blockSection.Replace("\n", "");
+        var pins = new HashSet<Pin>(9);
+        for (var i = 0; i < 3; i++)
+        {
+            for (var j = 0; j < 3; j++)
+            {
+                if (blockSection[3 *i +  j] == '#')
+                {
+                    pins.Add(new Pin(i, j));
+                }
+            }
+        }
+
+        return new Block(pins);
+    }
+
+    public override string ToString()
+    {
+        var ret = "";
+        for (var i = 0; i < 3; i++)
+        {
+            for (var j = 0; j < 3; j++)
+            {
+                ret += Pins.Contains(new Pin(i, j)) ? "#" : ".";
+
+            }
+
+            ret += "\n";
+        }
+        return ret;
+    }
+
+    public Block Flip()
+    {
+        return new Block((from pin in Pins select new Pin(pin.Y, pin.X)).ToHashSet());
+    }
+};
+
+public class Day12
+{
+    private static string GetBlockSections(string document)
+    {
+        var xIndex = document.IndexOf("x");
+
+        var index = -1;
+        while (true)
+        {
+            var newIndex = document.IndexOf("\n", index + 1);
+            if (newIndex > xIndex)
+            {
+                return document.Substring(0, index -1);
+            }
+
+            index = newIndex;
+        }
+    }
+
+    static string ToBlockString(string blockSection)
+    {
+        return blockSection.Substring(blockSection.IndexOf("\n"));
+
+    }
+
+    static List<Block> ParseBlocks(string document)
+    {
+        var blockSections = GetBlockSections(document).Split("\n\n");
+        return (from blockSection in blockSections select Block.CreateBlock(ToBlockString(blockSection))).ToList();
+    }
+
+    
+
+    public static void Main(string[] args)
+    {
+        var b = Block.CreateBlock("###\n##.\n##.");
+        Console.WriteLine(b);
+        Console.WriteLine("\n\n\n");
+        Console.WriteLine(b.Flip());
+        
+        Console.WriteLine("\n\n\n");
+        Console.WriteLine(b.Flip().Flip());
+        
+    }
+}