Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Random Pick with Weight | Medium | ArrayMathBinary Search |
| 167 | Random Point in Non-overlapping Rectangles | Medium | ArrayMathBinary Search |
| 168 | Range Addition | Medium | ArrayPrefix Sum |
| 169 | Range Product Queries of Powers | Medium | ArrayBit ManipulationPrefix Sum |
| 170 | Range Sum of Sorted Subarray Sums | Medium | ArrayTwo PointersBinary Search |
| 171 | Range Sum Query 2D - Immutable | Medium | ArrayDesignMatrix |
| 172 | Range Sum Query - Immutable | Easy | ArrayDesignPrefix Sum |
| 173 | Rearrange Array to Maximize Prefix Score | Medium | ArrayGreedySorting |
| 174 | Removing Minimum Number of Magic Beans | Medium | ArrayGreedySorting |
| 175 | Running Sum of 1d Array | Easy | ArrayPrefix Sum |
| 176 | Shift Distance Between Two Strings | Medium | ArrayStringPrefix Sum |
| 177 | Shifting Letters | Medium | ArrayStringPrefix Sum |
| 178 | Shifting Letters II | Medium | ArrayStringPrefix Sum |
| 179 | Shortest Subarray with Sum at Least K | Hard | ArrayBinary SearchQueue |
| 180 | Smallest Rotation with Highest Score | Hard | ArrayPrefix Sum |
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