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Merge pull request #178 from jojoo15/patch-10

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添加 0700.二叉搜索树中的搜索 python版本
This commit is contained in:
Carl Sun
2021-05-19 00:38:42 +08:00
committed by GitHub
parent 6ab146548e 0b3945cfd1
commit bd5e99bbf8
1 changed files with 11 additions and 6 deletions
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15
problems/0700.二叉搜索树中的搜索.md
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@ -212,13 +212,18 @@ Python：
递归法：
```python
# Definition for a binary tree node.
# class TreeNode:
# def __init__(self, val=0, left=None, right=None):
# self.val = val
# self.left = left
# self.right = right
class Solution:
def searchBST(self, root: TreeNode, val: int) -> TreeNode:
if root is None:
return None
if val < root.val: return self.searchBST(root.left, val)
elif val > root.val: return self.searchBST(root.right, val)
else: return root
if not root or root.val == val: return root //为空或者已经找到都是直接返回root，所以合并了
if root.val > val: return self.searchBST(root.left,val) //注意一定要加return
else: return self.searchBST(root.right,val)
```
迭代法：