What is Recursive Algorithm? Types and Methods | Simplilearn

Check if a Binary Tree is BST or not - GeeksforGeeks

DevAurA on Instagram: "Most important DSA questions you should know before appearing for any interview 1. Two Sum – Use HashMap to store visited elements and check complement. 2. Best Time to Buy and Sell Stock – Track minimum price and max profit. 3. Contains Duplicate – Use HashSet to detect duplicates. 4. Product of Array Except Self – Prefix and suffix multiplication. 5. Maximum Subarray – Kadane’s Algorithm. 6. Longest Substring Without Repeating Characters – Sliding Window. 7. Valid Anagra