Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Closest Room | Hard | ArrayBinary SearchSorting |
| 167 | Closest Subsequence Sum | Hard | ArrayTwo PointersDynamic Programming |
| 168 | Coin Change | Medium | ArrayDynamic ProgrammingBreadth-First Search |
| 169 | Coin Change II | Medium | ArrayDynamic Programming |
| 170 | Coin Path | Hard | ArrayDynamic Programming |
| 171 | Collect Coins in a Tree | Hard | ArrayTreeGraph |
| 172 | Collecting Chocolates | Medium | ArrayEnumeration |
| 173 | Color the Triangle Red | Hard | ArrayMath |
| 174 | Coloring A Border | Medium | ArrayDepth-First SearchBreadth-First Search |
| 175 | Combination Sum | Medium | ArrayBacktracking |
| 176 | Combination Sum II | Medium | ArrayBacktracking |
| 177 | Combination Sum III | Medium | ArrayBacktracking |
| 178 | Combination Sum IV | Medium | ArrayDynamic Programming |
| 179 | Compare Strings by Frequency of the Smallest Character | Medium | ArrayHash TableString |
| 180 | Concatenated Divisibility | Hard | ArrayDynamic ProgrammingBit Manipulation |
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