Learn essential coding patterns to answer problems and prepare for tech companies' interviews.

Ace the JavaScript Coding Interview

This module teaches us the underlying patterns behind common coding interview questions. By learning these essential patterns, we'll be able to unpack and answer any problem the right way—just by assessing the problem statement. This approach was created by FAANG hiring managers to help us prepare for the typical rounds of interviews at major tech companies like Apple, Google, Meta, Microsoft, and Amazon.

By the end of this module, we'll have the skills we need to unlock even the most challenging questions, grok the coding interview, and level up our career with confidence.

Coding Interview Patterns

# 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:**

- $-10^{4} \leq$ `Node.data` $\leq 10^{4}$

- The tree contains nodes in the range
 $[1, 500]$.


# Examples

Try to solve the Validate Binary Search Tree problem.



Validate Binary Search Tree

Try to solve the Validate Binary Search Tree problem.