Problem:
Check whether a binary tree is a valid BST, meaning:
All nodes in the left subtree are less than the current node
All nodes in the right subtree are greater than the current node
This rule holds recursively for every node
✅ In this video, we cover:
Recursive DFS with boundary checks
In-order traversal to confirm strictly increasing order
📌 Problem:
https://leetcode.com/problems/validate-binary-search-tree/
📌 Submission:
https://leetcode.com/problems/validate-binary-search-tree/submissions/1687382768/
📌 Timestamps:
00:00 – Intro
00:45 – What Makes a Tree a Valid BST?
02:30 – brute force
03:40 – In-order traversal explanation
15:05 – Code implementation & edge cases
#Blind75 #DSA #TechInterview #CodingPreparation #InterviewPrep
