Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 346 | Linked List Cycle II | Medium | Hash TableLinked ListTwo Pointers |
| 347 | Linked List Frequency | Unknown | Hash TableLinked ListCounting |
| 348 | Logger Rate Limiter | Easy | Hash TableDesignData Stream |
| 349 | Lonely Pixel I | Medium | ArrayHash TableMatrix |
| 350 | Lonely Pixel II | Medium | ArrayHash TableMatrix |
| 351 | Longest Arithmetic Subsequence | Medium | ArrayHash TableBinary Search |
| 352 | Longest Arithmetic Subsequence of Given Difference | Medium | ArrayHash TableDynamic Programming |
| 353 | Longest Common Subsequence Between Sorted Arrays | Medium | ArrayHash TableCounting |
| 354 | Longest Consecutive Sequence | Medium | ArrayHash TableUnion Find |
| 355 | Longest Harmonious Subsequence | Easy | ArrayHash TableSliding Window |
| 356 | Longest Ideal Subsequence | Medium | Hash TableStringDynamic Programming |
| 357 | Longest Nice Substring | Easy | Hash TableStringDivide and Conquer |
| 358 | Longest Palindrome | Easy | Hash TableStringGreedy |
| 359 | Longest Palindrome by Concatenating Two Letter Words | Medium | ArrayHash TableString |
| 360 | Longest Repeating Character Replacement | Medium | Hash TableStringSliding Window |
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