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Deadline: 18th January 2026

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Duration: 6 Months
Program Mode: Online
Taught By: IIT Roorkee Professors

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📊 Excel Interview Question

❓ What is the difference between VLOOKUP and XLOOKUP?

🧠 Key Differences Explained Simply:

🔹 Lookup Direction

• VLOOKUP → Can only search left to right
• XLOOKUP → Can search both left → right and right → left

🔹 Column Dependency

• VLOOKUP → Depends on column number (breaks if columns move)
• XLOOKUP → No column number required (more reliable)

🔹 Error Handling

• VLOOKUP → Returns #N/A if value not found
• XLOOKUP → Built-in option to handle missing values gracefully

🔹 Flexibility & Performance

• VLOOKUP → Limited and outdated
• XLOOKUP → Modern, flexible, and recommended by Microsoft

🚀 Final Verdict:

If Excel version allows, always prefer XLOOKUP for cleaner, safer, and future-proof formulas.

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✅ Top 50 Coding Interview Questions You Must Prepare 💻🧠

1. What is the difference between compiled and interpreted languages?
2. What is time complexity? Why does it matter in interviews?
3. What is space complexity?
4. Explain Big O notation with examples.
5. Difference between array and linked list.
6. What is a stack? Real use cases.
7. What is a queue? Types of queues.
8. Difference between stack and queue.
9. What is recursion? When should you avoid it?
10. Difference between recursion and iteration.
11. What is a hash table? How does hashing work?
12. What are collisions in hashing? How do you handle them?
13. Difference between HashMap and HashSet.
14. What is a binary tree?
15. What is a binary search tree?
16. Difference between BFS and DFS.
17. What is a balanced tree?
18. What is heap data structure?
19. Difference between min heap and max heap.
20. What is a graph? Directed vs undirected.
21. What is adjacency matrix vs adjacency list?
22. What is sorting? Name common sorting algorithms.
23. Difference between quick sort and merge sort.
24. Which sorting algorithm is fastest and why?
25. What is searching? Linear vs binary search.
26. Why binary search needs sorted data?
27. What is dynamic programming?
28. Difference between greedy and dynamic programming.
29. What is memoization?
30. What is backtracking?
31. What is a pointer?
32. Difference between pointer and reference.
33. What is memory leak?
34. What is segmentation fault?
35. Difference between process and thread.
36. What is multithreading?
37. What is synchronization?
38. What is deadlock?
39. Conditions for deadlock.
40. Difference between shallow copy and deep copy.
41. What is exception handling?
42. Checked vs unchecked exceptions.
43. What is mutable vs immutable object?
44. What is garbage collection?
45. What is REST API?
46. What is JSON?
47. Difference between HTTP and HTTPS.
48. What is version control? Why Git matters?
49. Explain a coding problem you optimized recently.
50. How do you approach a new coding problem in interviews?

💬 Tap ❤️ for detailed answers

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