python--剑指offer--简单--68 - II. 二叉树的最近公共祖先
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2022-07-14 14:37:34
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class Solution:
def lowestCommonAncestor(self, root: TreeNode, p: TreeNode, q: TreeNode) -> TreeNode:
if not root or root == p or root == q: return root
left = self.lowestCommonAncestor(root.left, p, q)
right = self.lowestCommonAncestor(root.right, p, q)
if not left: return right
if not right: return left
return root
class Solution:
def lowestCommonAncestor(self, root: TreeNode, p: TreeNode, q: TreeNode) -> TreeNode:
if not root or root == p or root == q: return root
left = self.lowestCommonAncestor(root.left, p, q)
right = self.lowestCommonAncestor(root.right, p, q)
if not left and not right: return # 1.
if not left: return right # 3.
if not right: return left # 4.
return root # 2. if left and right:
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