Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 181 | Sorted GCD Pair Queries | Hard | ArrayHash TableMath |
| 182 | Special Array II | Medium | ArrayBinary SearchPrefix Sum |
| 183 | Split Array Largest Sum | Hard | ArrayBinary SearchDynamic Programming |
| 184 | Split Array with Equal Sum | Hard | ArrayHash TablePrefix Sum |
| 185 | Stamping the Grid | Hard | ArrayGreedyMatrix |
| 186 | Stone Game II | Medium | ArrayMathDynamic Programming |
| 187 | Stone Game VIII | Hard | ArrayMathDynamic Programming |
| 188 | Subarray Product Less Than K | Medium | ArrayBinary SearchSliding Window |
| 189 | Subarray Sum Equals K | Medium | ArrayHash TablePrefix Sum |
| 190 | Subarray Sums Divisible by K | Medium | ArrayHash TablePrefix Sum |
| 191 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 192 | Sum of Absolute Differences in a Sorted Array | Medium | ArrayMathPrefix Sum |
| 193 | Sum of All Odd Length Subarrays | Easy | ArrayMathPrefix Sum |
| 194 | Sum of Distances | Medium | ArrayHash TablePrefix Sum |
| 195 | Sum of Floored Pairs | Hard | ArrayMathBinary Search |
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