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

Solution: Validate Binary Search Tree

Explore how to validate whether a binary tree is a binary search tree by using depth-first in-order traversal. Learn to check node values in ascending order and ensure BST properties, while analyzing time and space complexity of the solution.

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:

  • −104≤-10^{4} \leq ...