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PhonePe DSA Interview Questions

Accelerate your fintech interview preparation with the definitive PhonePe DSA preparation sheet, custom-engineered for freshers, SDE-1, and SDE-2 aspirants. PhonePe's hyper-scale transaction infrastructure demands highly optimized algorithmic logic capable of managing massive real-time UPI checkouts, microservices dependency flows, and high-concurrency ledger balances. This verified problem set contains 50 of the most frequently asked PhonePe coding interview questions across mission-critical archetypes—including transactional dynamic programming, graph-based routing paths, multi-heap data stream handlers, and thread-safe design structures. Equipped with direct LeetCode and GeeksforGeeks links alongside candidate frequency tags, this sheet is optimized to maximize user engagement and organic search value for your site.

50 Problems
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Overall Progress

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1. Coin Change
LeetCode•
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Very Hot
2. Network Delay Time
LeetCode•
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Very Hot
3. LRU Cache
LeetCode•
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Very Hot
6. Subarray Sum Equals K
LeetCode•
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Very Hot
7. Trapping Rain Water
LeetCode•
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Very Hot
8. Course Schedule II
LeetCode•
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Hot
9. Merge Intervals
LeetCode•
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Hot
12. Two Sum
LeetCode•
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Hot
13. Maximum Subarray
LeetCode•
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Hot
14. Word Break
LeetCode•
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Hot
16. Search in Rotated Sorted Array
LeetCode•
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Very Hot
17. Number of Islands
LeetCode•
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Warm
19. Decode String
LeetCode•
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Hot
20. Valid Parentheses
LeetCode•
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Hot
22. Group Anagrams
LeetCode•
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Warm
26. Climbing Stairs
LeetCode•
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Hot
28. LFU Cache
LeetCode•
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Hot
29. Subsets
LeetCode•
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Warm
30. Reverse Linked List
LeetCode•
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Hot
31. Linked List Cycle
LeetCode•
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Hot
33. House Robber
LeetCode•
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Hot
34. Next Permutation
LeetCode•
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Warm
35. Rotting Oranges
LeetCode•
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Hot
36. Top K Frequent Words
LeetCode•
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Warm
39. 3Sum
LeetCode•
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Hot
40. Spiral Matrix
LeetCode•
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Warm
42. Decode Ways
LeetCode•
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Warm
45. Gas Station
LeetCode•
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Hot
46. Word Search
LeetCode•
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Warm
49. Permutations
LeetCode•
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Warm
50. Edit Distance
LeetCode•
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Warm