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Grokking the Coding Interview Patterns in Python

Solution: Validate Binary Search Tree

Explore how to validate a binary search tree by using an inorder traversal method to confirm nodes are in strictly increasing order, ensuring it meets BST conditions. Understand the implementation details and the time and space complexity of this algorithm.

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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:

  • The left subtree of a node contains only nodes with keys less than the node’s key.

  • The right subtree of a node contains only nodes with keys greater than the node’s key.

  • Both the left and right subtrees are valid BSTs.

Constraints:

  • −104≤-10^{4} \leq ...