Top 20 DSA questions asked in Data Engineering interviews at MAANG


1. Given an array of integers and a target value, find two numbers in the array that sum up to the target. Return the indices of the two numbers.
2. How do you reverse a singly linked list?
3. How do you find the missing number in an array of size N with numbers from 1 to N+1?
4. What is the approach to detect a cycle in a linked list?
5. How would you merge two sorted arrays?
6. How do you find the Kth largest element in an unsorted array?
7. What’s the approach to finding the longest substring without repeating characters?
8. How do you find the middle element of a linked list?
9. Explain level order traversal in a binary tree.
10. How do you find the Lowest Common Ancestor (LCA) of two nodes in a binary tree?
11. How do you find the maximum sum subarray (using Kadane's Algorithm)?
12. What’s the approach for finding the longest common subsequence between two strings?
13. How would you merge two sorted linked lists?
14. How do you check if parentheses in an expression are valid?
15. What is the binary search algorithm and how do you implement it?
16. How would you find the duplicate number in an array containing numbers from 1 to N?
17. What is the approach to reversing a string?
18. How do you find the product of all elements in an array except the current element?
19. How would you group anagrams from a list of strings?
20. How would you solve a Sudoku puzzle using backtracking?

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