Solution: Validate Binary Search Tree
Explore the method to validate a binary search tree by using in-order traversal. This lesson helps you understand how to check each node’s value against the previous one to confirm BST properties, and implement an efficient algorithm in C++ with clear time and space complexity considerations.
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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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