[LeetCode] Validate Binary Search Tree
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node ...
原文：[leetcode]Validate Binary Search Tree @ Python
原题地址：https: oj.leetcode.com problems validate binary search tree 题意：检测一颗二叉树是否是二叉查找树。 解题思路：看到二叉树我们首先想到需要进行递归来解决问题。这道题递归的比较巧妙。让我们来看下面一棵树： 对于这棵树而言，怎样进行递归呢 root.left这棵树的所有节点值都小于root，root.right这棵树的所有节点值都大于 ...
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