Question bank

4,310 interview questions, answered.

Reference answers, what the interviewer is really testing, how it is graded, and the follow-ups that come next.

Easy 190Medium 2,498Hard 982
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4,310 questions

  1. 121Check for Contradictions in EquationsCoding· Microsoft, PhonePe
  2. 122Check If a Number Is a Majority Element in a Sorted ArrayCoding· ZZupee
  3. 123Check if a tree is a BST or notCoding· M2P Fintech
  4. 124Climbing StairsEasyCoding· Media.net
  5. 125Closest Binary Search Tree Value IICoding· Meta
  6. 126Coin PathCoding· Amazon, PhonePe
  7. 127Combination SumCoding· eBay
  8. 128Combination Sum IICoding· InfoEdge India Ltd
  9. 129Compare supervised fine-tuning, preference optimization, and reinforcement learning from feedback.Hard· 30 min
  10. 130Concatenate One String to AnotherCoding· M2P Fintech
  11. 131Confusing Number IICoding· Media.net
  12. 132Connecting Cities With Minimum CostCoding· Amazon
  13. 133Convert Digits/Numbers to WordsCoding· TCS
  14. 134Correct a Binary TreeCoding· TCS
  15. 135Count of Subarrays with Sum Divisible by KCoding· Morgan Stanley
  16. 136Count subarrays with given sumCoding· Amazon, Meta
  17. 137Course Schedule ICoding· Microsoft, Visa
  18. 138Course Schedule IICoding· Atlassian, Flipkart
  19. 139Delete a node in BSTCoding· Oracle
  20. 140Design a model router that balances quality, latency, and cost.HardSystem design· 30 min
  21. 141Design a production AI developer platforms system from data collection through serving.HardSystem design· 30 min
  22. 142Design a production AI incident response system from data collection through serving.HardSystem design· 30 min
  23. 143Design a production AI watermarking system from data collection through serving.HardSystem design· 30 min
  24. 144Design a production content moderation system from data collection through serving.HardSystem design· 30 min