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Update 0235.二叉搜索树的最近公共祖先.md

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problems/0235.二叉搜索树的最近公共祖先.md
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@ -275,34 +275,57 @@ class Solution {
## Python
递归法：
递归法（版本一）
```python
class Solution:
"""二叉搜索树的最近公共祖先 递归法"""
def traversal(self, cur, p, q):
if cur is None:
return cur
# 中
if cur.val > p.val and cur.val > q.val: # 左
left = self.traversal(cur.left, p, q)
if left is not None:
return left
def lowestCommonAncestor(self, root: 'TreeNode', p: 'TreeNode', q: 'TreeNode') -> 'TreeNode':
if root.val > p.val and root.val > q.val:
return self.lowestCommonAncestor(root.left, p, q)
if root.val < p.val and root.val < q.val:
return self.lowestCommonAncestor(root.right, p, q)
return root
if cur.val < p.val and cur.val < q.val: # 右
right = self.traversal(cur.right, p, q)
if right is not None:
return right
return cur
def lowestCommonAncestor(self, root, p, q):
return self.traversal(root, p, q)
```
迭代法：
迭代法（版本二）精简
```python
class Solution:
"""二叉搜索树的最近公共祖先 迭代法"""
def lowestCommonAncestor(self, root, p, q):
if root.val > p.val and root.val > q.val:
return self.lowestCommonAncestor(root.left, p, q)
elif root.val < p.val and root.val < q.val:
return self.lowestCommonAncestor(root.right, p, q)
else:
return root
def lowestCommonAncestor(self, root: 'TreeNode', p: 'TreeNode', q: 'TreeNode') -> 'TreeNode':
while True:
```
迭代法
```python
class Solution:
def lowestCommonAncestor(self, root, p, q):
while root:
if root.val > p.val and root.val > q.val:
root = root.left
elif root.val < p.val and root.val < q.val:
root = root.right
else:
return root
```
return None
```
## Go
递归法：