Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 346 | Longest Duplicate Substring | Hard | StringBinary SearchSliding Window |
| 347 | Longest Happy Prefix | Hard | StringRolling HashString Matching |
| 348 | Longest Happy String | Medium | StringGreedyHeap (Priority Queue) |
| 349 | Longest Ideal Subsequence | Medium | Hash TableStringDynamic Programming |
| 350 | Longest Nice Substring | Easy | Hash TableStringDivide and Conquer |
| 351 | Longest Palindrome | Easy | Hash TableStringGreedy |
| 352 | Longest Palindrome After Substring Concatenation I | Medium | Two PointersStringDynamic Programming |
| 353 | Longest Palindrome After Substring Concatenation II | Hard | Two PointersStringDynamic Programming |
| 354 | Longest Palindrome by Concatenating Two Letter Words | Medium | ArrayHash TableString |
| 355 | Longest Palindromic Subsequence | Medium | StringDynamic Programming |
| 356 | Longest Palindromic Subsequence After at Most K Operations | Medium | StringDynamic Programming |
| 357 | Longest Palindromic Subsequence II | Medium | StringDynamic Programming |
| 358 | Longest Palindromic Substring | Medium | Two PointersStringDynamic Programming |
| 359 | Longest Path With Different Adjacent Characters | Hard | ArrayStringTree |
| 360 | Longest Repeating Character Replacement | Medium | Hash TableStringSliding Window |
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