From 7d8e9e8fae9d580013b717ff882bd9a942fe0e4f Mon Sep 17 00:00:00 2001
From: Guang-Hou <87743934+Guang-Hou@users.noreply.github.com>
Date: Wed, 9 Feb 2022 16:37:44 -0500
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Python 递归法- 无返回值的一种更简单的实现。
---
 .../0701.二叉搜索树中的插入操作.md | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/problems/0701.二叉搜索树中的插入操作.md b/problems/0701.二叉搜索树中的插入操作.md
index 468f2675..5e9fbdfe 100644
--- a/problems/0701.二叉搜索树中的插入操作.md
+++ b/problems/0701.二叉搜索树中的插入操作.md
@@ -310,6 +310,26 @@ class Solution:
         return root
 ``` 
 
+**递归法** - 无返回值 - another easier way
+```python
+class Solution:
+    def insertIntoBST(self, root: Optional[TreeNode], val: int) -> Optional[TreeNode]:
+        newNode = TreeNode(val)
+        if not root: return newNode
+        
+        if not root.left and val < root.val:
+            root.left = newNode
+        if not root.right and val > root.val:
+            root.right = newNode
+        
+        if val < root.val:
+            self.insertIntoBST(root.left, val)
+        if val > root.val:
+            self.insertIntoBST(root.right, val)
+        
+        return root
+```
+
 **迭代法**  
 与无返回值的递归函数的思路大体一致 
 ```python