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Update 0701.二叉搜索树中的插入操作.md

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0701.二叉搜索树中的插入操作.md Python3 **递归法** - 无返回值 有注释 不用Helper function - 删掉无用变量 增加python标志
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@ -331,9 +331,8 @@ class Solution:
``` ```
**递归法** - 无返回值 有注释 不用Helper function **递归法** - 无返回值 有注释 不用Helper function
``` ```python
class Solution: class Solution:
last = None
def insertIntoBST(self, root: Optional[TreeNode], val: int) -> Optional[TreeNode]: def insertIntoBST(self, root: Optional[TreeNode], val: int) -> Optional[TreeNode]:
if not root: # for root==None if not root: # for root==None
return TreeNode(val) return TreeNode(val)