Given a binary tree's root, determine whether it is a BST. Then, determine whether it is a valid BST. A BST is a tree in which both subtrees are binary search trees and in which the subtrees of each node are also BSTs.

Given a binary tree's root, determine whether it is a BST. Then, determine whether it is a valid BST. A BST is a tree in which both subtrees are binary search trees and in which the subtrees of each node are also BSTs.

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: easy

标签: interviewbit, virtusa, company-specific

目标公司: Virtusa

参考答案摘要

We can easily solve this problem with the help of recursion. Just we need to see that every subtree must be a binary search tree. So here is the approach for the solution using the recursion. class So...

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