Leetcode Interview Problem Validate Binary U2PV7 Jca2o

Web Reference: Can you solve this real interview question? Validate Binary Search Tree - Given the root of a binary tree, determine if it is a valid binary search tree (BST). A valid BST is defined as follows: * The left subtree of a node contains only nodes with keys strictly less than the node's key. Problem Description You are given the root of a binary tree. Your task is to determine whether this tree is a valid Binary Search Tree (BST). A valid BST must satisfy these properties: Every node in the left subtree of a node must have values strictly less than that node's value We can perform a recursive in-order traversal on the binary tree. If the result of the traversal is strictly ascending, then this tree is a binary search tree. Therefore, we use a variable prev to save the last node we traversed. Initially, prev = -∞. Then we recursively traverse the left subtree.

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