Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in JavaScript

Solution: Validate Binary Search Tree

Explore how to validate a binary search tree by performing an in-order traversal that visits nodes in ascending order. Learn to track previous node values to ensure BST properties and understand the time and space complexity of this approach.

We'll cover the following...

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:

  • ...