Solution: Validate Binary Search Tree
Understand how to verify if a binary tree is a valid binary search tree by using an in-order traversal to check node values in ascending order. Learn to track previous node values during traversal to detect violations, ensuring you can solve BST validation problems efficiently with O(n) time and space complexity.
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Statement
Given the root of a binary tree, check whether it is a valid binary search tree (BST).
A binary tree is a valid BST if for every node:
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The left subtree of a node contains only nodes with keys less than the node’s key.
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The right subtree of a node contains only nodes with keys greater than the node’s key.
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Both the left and right subtrees are valid BSTs.
Constraints:
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