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. 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. Mar 13, 2026 · A step-by-step walkthrough of LeetCode #98 as it plays out in a real coding interview. Learn the bounds-propagation technique, why the naive local-check approach fails, and the edge cases that catch even experienced candidates.
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