Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 181 | Collect Coins in a Tree | Hard | ArrayTreeGraph |
| 182 | Collecting Chocolates | Medium | ArrayEnumeration |
| 183 | Color the Triangle Red | Hard | ArrayMath |
| 184 | Coloring A Border | Medium | ArrayDepth-First SearchBreadth-First Search |
| 185 | Combination Sum | Medium | ArrayBacktracking |
| 186 | Combination Sum II | Medium | ArrayBacktracking |
| 187 | Combination Sum III | Medium | ArrayBacktracking |
| 188 | Combination Sum IV | Medium | ArrayDynamic Programming |
| 189 | Compare Strings by Frequency of the Smallest Character | Medium | ArrayHash TableString |
| 190 | Concatenated Divisibility | Hard | ArrayDynamic ProgrammingBit Manipulation |
| 191 | Concatenated Words | Hard | ArrayStringDynamic Programming |
| 192 | Concatenation of Array | Easy | ArraySimulation |
| 193 | Constrained Subsequence Sum | Hard | ArrayDynamic ProgrammingQueue |
| 194 | Construct 2D Grid Matching Graph Layout | Hard | ArrayHash TableGraph |
| 195 | Construct Binary Search Tree from Preorder Traversal | Medium | ArrayStackTree |
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