leetcode -- Lowest Common Ancestor of a Binary Search Tree -- 简单递归，掌握思想
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https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/
ref: http://bookshadow.com/weblog/2015/07/11/leetcode-lowest-common-ancestor-binary-search-tree/
class Solution(object): def lowestCommonAncestor(self, root, p, q): """ :type root: TreeNode :type p: TreeNode :type q: TreeNode :rtype: TreeNode """ if (q.val - root.val) * (p.val - root.val) <= 0: return root.val elif q.val > root.val : return self.lowestCommonAncestor(root.right, p, q) else: return self.lowestCommonAncestor(root.left, p, q) 0 0
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