Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 571 | Permutation in String | Medium | Hash TableTwo PointersString |
| 572 | Phone Number Prefix | Easy | ArrayStringTrie |
| 573 | Plates Between Candles | Medium | ArrayStringBinary Search |
| 574 | Positions of Large Groups | Easy | String |
| 575 | Prefix and Suffix Search | Hard | ArrayHash TableString |
| 576 | Print Words Vertically | Medium | ArrayStringSimulation |
| 577 | Push Dominoes | Medium | Two PointersStringDynamic Programming |
| 578 | Pyramid Transition Matrix | Medium | Hash TableStringBacktracking |
| 579 | Query Kth Smallest Trimmed Number | Medium | ArrayStringDivide and Conquer |
| 580 | Rank Teams by Votes | Medium | ArrayHash TableString |
| 581 | Ransom Note | Easy | Hash TableStringCounting |
| 582 | Rearrange Characters to Make Target String | Easy | Hash TableStringCounting |
| 583 | Rearrange K Substrings to Form Target String | Medium | Hash TableStringSorting |
| 584 | Rearrange Spaces Between Words | Easy | String |
| 585 | Rearrange String k Distance Apart | Hard | Hash TableStringGreedy |
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