Day i do not know

112. Path Sum/Solution.cs

@@ -0,0 +1,21 @@
+namespace _112._Path_Sum;
+
+public class Solution
+{
+    public bool HasPathSum(TreeNode root, int targetSum) 
+        => root != null ? Recursion(root, root.val, targetSum) : false;
+
+    private bool Recursion(TreeNode? node, int curSum, int targetSum)
+    {
+        if (curSum == targetSum && node != null && node.left == null && node.right == null)
+            return true;
+        if (node == null)
+            return false;
+        bool res = false;
+        if(node.left != null)
+            res |= Recursion(node.left, curSum + node.left.val, targetSum);
+        if (node.right != null)
+            res |= Recursion(node.right, curSum + node.right.val, targetSum);
+        return res;
+    }
+}