Data Structures and Algorithms with Python | Free DSA with Python Course - DSA in Python Course - Validate Binary Search Tree | Range Validation | LeetCode Medium | Part 177

📘 Welcome to Part 177 of Code & Debug's DSA in Python Course! In this video, we solve the important problem: Validate Binary Search Tree from LeetCode. We'll implement an efficient recursive solution using range validation technique that checks if a given binary tree satisfies the BST property by ensuring each node's value falls within the valid range based on its ancestors. This problem is crucial for understanding BST validation and is frequently asked in coding interviews to test your understanding of tree properties and recursive thinking. 👨‍🏫 What's covered in this video: 1. Understanding the problem statement from LeetCode 2. Why simple left-root-right check is insufficient 3. Range validation technique with upper and lower bounds 4. Step-by-step recursive approach implementation 5. How ranges get updated for left and right subtrees 6. Complete Python code walkthrough with helper function 7. Time and Space Complexity analysis 8. Edge cases and common pitfalls in BST validation 9. Interview tips and alternative approaches By the end of this session, you'll master the concept of BST validation and understand how to apply range-based recursive techniques to solve tree problems! 🔗 LeetCode Problem - Validate Binary Search Tree: https://leetcode.com/problems/validate-binary-search-tree/description/ 📄 Full Playlist Sheet (All Questions in Order): https://docs.google.com/spreadsheets/d/1AWE15Fy3wD2iqu2vjK_R7cCiuvSsjYQclcdZmHpF66o/edit?usp=sharing 🎓 Enroll in the FREE Python DSA Course: https://codeanddebug.in/course/master-dsa-with-leetcode 🚀 Advance Python DSA for FAANG (Zero to Hero Course): https://codeanddebug.in/course/zero-to-hero-python-dsa Stay focused and keep coding with Code & Debug. Like | Share | Subscribe | Hit the 🔔 #ValidateBST #BinarySearchTree #RangeValidation #LeetCode #PythonDSA #TreeProblems #CodeAndDebug #Part177 #DataStructures #BST #RecursiveApproach #DSAforInterviews #LeetCodeMedium #TreeValidation