part one complete

AdventOfCode2025/AdventOfCode2025.csproj

@@ -36,6 +36,10 @@
       <Content Include="Input\DaySix.txt">
         <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       </Content>
+      <None Remove="Input\DaySeven.txt" />
+      <Content Include="Input\DaySeven.txt">
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      </Content>
     </ItemGroup>
 
 </Project>

AdventOfCode2025/Laboratories.cs

@@ -0,0 +1,32 @@
+using AdventOfCode2025.Utils;
+
+namespace AdventOfCode2025;
+
+public class Laboratories : IAdventSolution
+{
+    public AdventSolution Solve(string input)
+    {
+        var lines = input.SplitLines();
+        var start = lines[0].IndexOf('S');
+        var splitters = new HashSet<Coordinate>();
+        var origin = new Coordinate(start, 0);
+        Traverse(lines, origin, splitters);
+        return new AdventSolution(splitters.Count.ToString(), null);
+    }
+
+    private void Traverse(string[] map, Coordinate start, HashSet<Coordinate> splitters)
+    {
+        if (start.X < 0 || start.X >= map[0].Length)
+            return;
+        
+        for (var y = start.Y; y < map.Length; y++)
+        {
+            if (map[y][start.X] != '^') continue;
+            if (!splitters.Add(new Coordinate(start.X, y))) return;
+            
+            Traverse(map, new Coordinate(start.X + 1, y), splitters);
+            Traverse(map, new Coordinate(start.X - 1, y), splitters);
+            return;
+        }
+    }
+}

AdventOfCode2025/Program.cs

@@ -19,3 +19,6 @@ AdventSolver<Cafeteria>.Solve(dayFiveInput, 5, "Cafeteria");
 
 var daySixInput = await File.ReadAllTextAsync("./Input/DaySix.txt");
 AdventSolver<TrashCompactor>.Solve(daySixInput, 6, "Trash Compactor");
+
+var daySevenInput = await File.ReadAllTextAsync("./Input/DaySeven.txt");
+AdventSolver<Laboratories>.Solve(daySevenInput, 7, "Laboratories");