Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 361 | Longest Palindrome by Concatenating Two Letter Words | Medium | ArrayHash TableString |
| 362 | Longest Repeating Character Replacement | Medium | Hash TableStringSliding Window |
| 363 | Longest Special Path | Hard | ArrayHash TableTree |
| 364 | Longest Special Path II | Hard | ArrayHash TableTree |
| 365 | Longest Square Streak in an Array | Medium | ArrayHash TableBinary Search |
| 366 | Longest String Chain | Medium | ArrayHash TableTwo Pointers |
| 367 | Longest Substring with At Least K Repeating Characters | Medium | Hash TableStringDivide and Conquer |
| 368 | Longest Substring with At Most K Distinct Characters | Medium | Hash TableStringSliding Window |
| 369 | Longest Substring with At Most Two Distinct Characters | Medium | Hash TableStringSliding Window |
| 370 | Longest Substring Without Repeating Characters | Medium | Hash TableStringSliding Window |
| 371 | Longest Uncommon Subsequence II | Medium | ArrayHash TableTwo Pointers |
| 372 | Longest Uploaded Prefix | Medium | Hash TableBinary SearchUnion Find |
| 373 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
| 374 | Longest Winning Streak | Hard | DatabaseHash TableSliding Window |
| 375 | Longest Word in Dictionary | Medium | ArrayHash TableString |
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