Web Reference: 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. In-depth solution and explanation for LeetCode 98. Validate Binary Search Tree in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Oct 11, 2025 · The idea is to validate a Binary Search Tree (BST) by maintaining a valid range (−∞, +∞) for every node. Initially, the root node can hold any value within this full range.
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