LeetCode题解: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 contains only nodes with keys less than the node’s key.
The right subtree of a node contains only nodes with keys greater than the node’s key.
Both the left and right subtrees must also be binary search trees.

题意:给定一棵二叉树,判断它是否为二叉搜索树

解决思路:按照二叉搜索树的性质迭代判断就可以了

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