Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 196 | Sum of K Subarrays With Length at Least M | Medium | ArrayDynamic ProgrammingPrefix Sum |
| 197 | Sum of Total Strength of Wizards | Hard | ArrayStackMonotonic Stack |
| 198 | Sum of Variable Length Subarrays | Easy | ArrayPrefix Sum |
| 199 | Taking Maximum Energy From the Mystic Dungeon | Medium | ArrayPrefix Sum |
| 200 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 201 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 202 | Ways to Make a Fair Array | Medium | ArrayPrefix Sum |
| 203 | Ways to Split Array Into Three Subarrays | Medium | ArrayTwo PointersBinary Search |
| 204 | Widest Pair of Indices With Equal Range Sum | Medium | ArrayHash TablePrefix Sum |
| 205 | XOR Queries of a Subarray | Medium | ArrayBit ManipulationPrefix Sum |
| 206 | Zero Array Transformation I | Medium | ArrayPrefix Sum |
| 207 | Zero Array Transformation II | Medium | ArrayBinary SearchPrefix Sum |
| 208 | Zero Array Transformation III | Medium | ArrayGreedySorting |
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