Merge branch 'youngyangyang04:master' into master

problems/0112.路径总和.md

@@ -475,6 +475,12 @@ class solution:
             return false  # 别忘记处理空treenode
         else:
             return isornot(root, targetsum - root.val)
+            
+class Solution: # 简洁版
+    def hasPathSum(self, root: Optional[TreeNode], targetSum: int) -> bool:
+        if not root: return False
+        if root.left==root.right==None and root.val == targetSum: return True
+        return self.hasPathSum(root.left,targetSum-root.val) or self.hasPathSum(root.right,targetSum-root.val)          
 ```
 
 **迭代 - 层序遍历**