Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Frequency of the Most Frequent Element | Medium | ArrayBinary SearchGreedy |
| 62 | Get Biggest Three Rhombus Sums in a Grid | Medium | ArrayMathSorting |
| 63 | Get Equal Substrings Within Budget | Medium | StringBinary SearchSliding Window |
| 64 | Grid Game | Medium | ArrayMatrixPrefix Sum |
| 65 | Increment Submatrices by One | Medium | ArrayMatrixPrefix Sum |
| 66 | Intervals Between Identical Elements | Medium | ArrayHash TablePrefix Sum |
| 67 | Jump Game VII | Medium | StringDynamic ProgrammingSliding Window |
| 68 | Largest Magic Square | Medium | ArrayMatrixPrefix Sum |
| 69 | Largest Sum of Averages | Medium | ArrayDynamic ProgrammingPrefix Sum |
| 70 | Left and Right Sum Differences | Easy | ArrayPrefix Sum |
| 71 | Longest Special Path | Hard | ArrayHash TableTree |
| 72 | Longest Special Path II | Hard | ArrayHash TableTree |
| 73 | Longest Subsequence With Limited Sum | Easy | ArrayBinary SearchGreedy |
| 74 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
| 75 | Make a Positive Array | Medium | ArrayGreedyPrefix Sum |
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