leetcode 236. Lowest Common Ancestor of a Binary Tree
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class Solution(object): def lowestCommonAncestor(self, root, p, q): """ :type root: TreeNode :type p: TreeNode :type q: TreeNode :rtype: TreeNode """ if root in (p,q,None): return root left_res = self.lowestCommonAncestor(root.left,p,q) right_res = self.lowestCommonAncestor(root.right,p,q) if left_res and right_res: return root else: return left_res if left_res else right_res
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