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In this post, you will find the solution for the **Validate Binary Search Tree** **in C++, Java & Python-LeetCode problem**. We are providing the **correct and tested solutions** to coding problems present on **LeetCode**. If you are not able to solve any problem, then you can take help from our Blog/website.

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LeetCode is for **software engineers who are looking to practice technical questions and advance their skills**. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either *Easy*, *Medium*, or *Hard*.

**LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:**

- Mathematics/Basic Logical Based Questions
- Arrays
- Strings
- Hash Table
- Dynamic Programming
- Stack & Queue
- Trees & Graphs
- Greedy Algorithms
- Breadth-First Search
- Depth-First Search
- Sorting & Searching
- BST (Binary Search Tree)
- Database
- Linked List
- Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

** Link for the Problem** – Validate Binary Search Tree– LeetCode Problem

Validate Binary Search Tree– LeetCode Problem

**Problem:**

Given the `root`

of a binary tree, *determine if it is a valid binary search tree (BST)*.

A **valid BST** is defined as follows:

- 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 must also be binary search trees.

**Example 1:**

Input:root = [2,1,3]Output:true

**Example 2:**

Input:root = [5,1,4,null,null,3,6]Output:falseExplanation:The root node's value is 5 but its right child's value is 4.

**Constraints:**

- The number of nodes in the tree is in the range
`[1, 10`

.^{4}] `-2`

^{31}<= Node.val <= 2^{31}- 1

Validate Binary Search Tree– LeetCode Solutions

Validate Binary Search Tree Solution in C++:

Validate Binary Search Tree Solution in Java:

Validate Binary Search Tree Solution in Python: