Ace Your Coding Interview: 20 Frequently Asked DSA Questions for Product-Based Companies

Mastering Data Structures & Algorithms is the key to cracking interviews at top tech firms and product-based companies. Here are 20 of the most commonly tested questions—covering arrays, stacks, queues, graphs, AVL trees, searching, and more. Sharpen your problem-solving skills, deepen your understanding, and use this list for revision before your next big interview!

20 Essential DSA Interview Topics & Questions

Arrays: Max subarray (Kadane’s), array rotations, finding duplicates, merge intervals.
Linked Lists: Detect cycle, reverse list, merge sorted lists, intersection, remove N-th node.
Stacks & Queues: Balanced parentheses, next greater element, implement min/max stack, circular queue.
Strings: Anagram detection, palindrome check, longest substring without repeats, KMP search.
Hash Tables: Hash map applications (LRU cache, frequency counting, union/intersection), open addressing vs chaining.
Trees & Binary Search: Traversals (inorder, preorder, level order), BST operations, AVL rotations, segment trees, lowest common ancestor.
Heaps & Priority Queues: Heap sort, maintain min/max heap, streaming median problem.
Graphs: BFS, DFS, shortest path (Dijkstra’s), cycle detection, topological sort.
Searching & Sorting: Binary search in rotated arrays, quick sort, merge sort, counting sort, radix sort.
Recursion & Advanced: Divide and conquer, dynamic programming classic problems like coin change, knapsack, edit distance.

Download the Full Q&A List

Get all 20 questions with detailed answers in this Google Doc:
👉 20 Most Asked DSA Coding Interview Questions & Answers

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Using This List

Practice problem-solving and code implementation for the topics above.
Revise concepts and scenarios that recruiters test frequently—from basics to advanced techniques.
Bookmark for your last-minute prep and share with friends looking for a job in tech!

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