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Grokking the Coding Interview Patterns in C++

Solution: Validate Binary Search Tree

Understand how to validate a binary search tree by applying an in-order traversal technique that ensures all nodes follow BST rules. Learn to track node values during traversal to confirm the tree's structure is valid, and analyze the solution's time and space complexities.

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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:

  • ...