Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 496 | Minimum Total Cost to Make Arrays Unequal | Hard | ArrayHash TableGreedy |
| 497 | Minimum Unlocked Indices to Sort Nums | Medium | ArrayHash Table |
| 498 | Minimum Window Substring | Hard | Hash TableStringSliding Window |
| 499 | Missing Number | Easy | ArrayHash TableMath |
| 500 | Most Common Word | Easy | ArrayHash TableString |
| 501 | Most Frequent Even Element | Easy | ArrayHash TableCounting |
| 502 | Most Frequent IDs | Medium | ArrayHash TableHeap (Priority Queue) |
| 503 | Most Frequent Number Following Key In an Array | Easy | ArrayHash TableCounting |
| 504 | Most Frequent Prime | Medium | ArrayHash TableMath |
| 505 | Most Frequent Subtree Sum | Medium | Hash TableTreeDepth-First Search |
| 506 | Most Popular Video Creator | Medium | ArrayHash TableString |
| 507 | Most Stones Removed with Same Row or Column | Medium | Hash TableDepth-First SearchUnion Find |
| 508 | N-Repeated Element in Size 2N Array | Easy | ArrayHash Table |
| 509 | Naming a Company | Hard | ArrayHash TableString |
| 510 | Next Closest Time | Medium | Hash TableStringBacktracking |
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