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Grokking the Coding Interview Patterns in Go

Solution: Validate Binary Search Tree

Understand how to validate a binary search tree by performing an in-order traversal that ensures each node value is greater than the previous one. Explore this technique to confirm the BST properties and assess the correctness of a binary tree efficiently.

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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:

  • ...