[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
原題地址：https: oj.leetcode.com problems validate binary search tree 題意：檢測一顆二叉樹是否是二叉查找樹。 解題思路：看到二叉樹我們首先想到需要進行遞歸來解決問題。這道題遞歸的比較巧妙。讓我們來看下面一棵樹： 對於這棵樹而言，怎樣進行遞歸呢 root.left這棵樹的所有節點值都小於root，root.right這棵樹的所有節點值都大於 ...
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