Merge pull request neetcode-gh#1369 from notauserx/Create-112-Path-Sum.cs

Create 112-Path-Sum.cs

Author: dissesmac

csharp/112-Path-Sum.cs

@@ -0,0 +1,24 @@
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     public int val;
+ *     public TreeNode left;
+ *     public TreeNode right;
+ *     public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+public class Solution {
+    public bool HasPathSum(TreeNode root, int targetSum) {
+        if(root == null) return false;
+        if(root.left == null && root.right == null) 
+            return targetSum == root.val;
+        
+        return 
+            HasPathSum(root.left,  targetSum - root.val) ||
+            HasPathSum(root.right, targetSum - root.val);
+    }
+}