Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 361 | Longest Repeating Substring | Medium | StringBinary SearchDynamic Programming |
| 362 | Longest String Chain | Medium | ArrayHash TableTwo Pointers |
| 363 | Longest Subsequence Repeated k Times | Hard | StringBacktrackingGreedy |
| 364 | Longest Substring Of All Vowels in Order | Medium | StringSliding Window |
| 365 | Longest Substring of One Repeating Character | Hard | ArrayStringSegment Tree |
| 366 | Longest Substring with At Least K Repeating Characters | Medium | Hash TableStringDivide and Conquer |
| 367 | Longest Substring with At Most K Distinct Characters | Medium | Hash TableStringSliding Window |
| 368 | Longest Substring with At Most Two Distinct Characters | Medium | Hash TableStringSliding Window |
| 369 | Longest Substring Without Repeating Characters | Medium | Hash TableStringSliding Window |
| 370 | Longest Uncommon Subsequence I | Easy | String |
| 371 | Longest Uncommon Subsequence II | Medium | ArrayHash TableTwo Pointers |
| 372 | Longest Unequal Adjacent Groups Subsequence I | Easy | ArrayStringDynamic Programming |
| 373 | Longest Unequal Adjacent Groups Subsequence II | Medium | ArrayStringDynamic Programming |
| 374 | Longest Valid Parentheses | Hard | StringDynamic ProgrammingStack |
| 375 | Longest Word in Dictionary | Medium | ArrayHash TableString |
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