Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Make Sum Divisible by P | Medium | ArrayHash TablePrefix Sum |
| 77 | Matrix Block Sum | Medium | ArrayMatrixPrefix Sum |
| 78 | Max Consecutive Ones III | Medium | ArrayBinary SearchSliding Window |
| 79 | Max Sum of Rectangle No Larger Than K | Hard | ArrayBinary SearchMatrix |
| 80 | Maximize Number of Subsequences in a String | Medium | StringGreedyPrefix Sum |
| 81 | Maximize Subarrays After Removing One Conflicting Pair | Hard | ArraySegment TreeEnumeration |
| 82 | Maximize the Beauty of the Garden | Hard | ArrayHash TableGreedy |
| 83 | Maximize the Confusion of an Exam | Medium | StringBinary SearchSliding Window |
| 84 | Maximize the Minimum Powered City | Hard | ArrayBinary SearchGreedy |
| 85 | Maximum Average Subarray II | Hard | ArrayBinary SearchPrefix Sum |
| 86 | Maximum Coins From K Consecutive Bags | Medium | ArrayBinary SearchGreedy |
| 87 | Maximum Coins Heroes Can Collect | Medium | ArrayTwo PointersBinary Search |
| 88 | Maximum Difference Between Even and Odd Frequency II | Hard | StringSliding WindowEnumeration |
| 89 | Maximum Frequency After Subarray Operation | Medium | ArrayHash TableDynamic Programming |
| 90 | Maximum Frequency of an Element After Performing Operations I | Medium | ArrayBinary SearchSliding Window |
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