Add another Day07 part 2 solution, that's way simpler

AoC_2025.Tests/Day07Test.cs

@@ -44,4 +44,24 @@ public class Day07Test
         
         Assert.Equal(53916299384254, actual);
     }
+    
+    [Fact]
+    public void Part02Again_Test_equals_40()
+    {
+        var sut = _sut as Day07;
+        
+        var actual = sut.SolvePart2Again(TestInputPath);
+        
+        Assert.Equal(40, actual);
+    }
+    
+    [Fact]
+    public void Part02Again_Prod_equals_53916299384254()
+    {
+        var sut = _sut as Day07;
+        
+        var actual = sut.SolvePart2Again(ProdInputPath);
+        
+        Assert.Equal(53916299384254, actual);
+    }
 }

AoC_2025/Day07.cs

@@ -29,8 +29,15 @@ public class Day07 : IPuzzleSolver<long>
     {
         var grid = ParsePuzzleInput(pathToPuzzleInput);
         var start = GetStart(grid);
-        var count = GetNodesTraversedWitTimelineCount(grid, start, [], []);
+        var nodesWithCount = GetNodesTraversedWitTimelineCount(grid, start, [], []);
-        return count[start];
+        return nodesWithCount[start];
+    }
+    
+    public long SolvePart2Again(string pathToPuzzleInput)
+    {
+        var grid = ParsePuzzleInput(pathToPuzzleInput);
+        var nodesWithCount = GetNodesTraversedWitTimelineCount(grid);
+        return nodesWithCount.Sum();
     }
 
     private Coordinate GetStart(string[] grid)
@@ -99,4 +106,34 @@ public class Day07 : IPuzzleSolver<long>
 
         return nodeCountVisited;
     }
+
+    private long[] GetNodesTraversedWitTimelineCount(string[] grid)
+    {
+        var numbersGrid = grid
+            .Select(line => line.Select(c => 0L).ToArray())
+            .ToArray();
+
+        for (var x = 1; x < numbersGrid.Length; x++)
+        {
+            for (var y = 0; y < numbersGrid[x].Length; y++)
+            {
+                var gridValue = grid[x - 1][y];
+                switch (gridValue)
+                {
+                    case 'S':
+                        numbersGrid[x][y] = 1;
+                        break;
+                    case '.':
+                        numbersGrid[x][y] += numbersGrid[x - 1][y];
+                        break;
+                    case '^':
+                        numbersGrid[x][y - 1] += numbersGrid[x - 1][y];
+                        numbersGrid[x][y + 1] += numbersGrid[x - 1][y];
+                        break;
+                }
+            }
+        }
+
+        return numbersGrid[^1];
+    }
 }