Practice problems across 75+ categories
Practice problems frequently asked at Sorting • 464 problems | 89 Easy | 273 Medium | 101 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 391 | Reveal Cards In Increasing Order | Medium | ArrayQueueSorting |
| 392 | Reward Top K Students | Medium | ArrayHash TableString |
| 393 | Robot Collisions | Hard | ArrayStackSorting |
| 394 | Russian Doll Envelopes | Hard | ArrayBinary SearchDynamic Programming |
| 395 | Search Suggestions System | Medium | ArrayStringBinary Search |
| 396 | Select K Disjoint Special Substrings | Medium | Hash TableStringDynamic Programming |
| 397 | Sell Diminishing-Valued Colored Balls | Medium | ArrayMathBinary Search |
| 398 | Set Intersection Size At Least Two | Hard | ArrayGreedySorting |
| 399 | Set Mismatch | Easy | ArrayHash TableBit Manipulation |
| 400 | Shortest Unsorted Continuous Subarray | Medium | ArrayTwo PointersStack |
| 401 | Single-Threaded CPU | Medium | ArraySortingHeap (Priority Queue) |
| 402 | Smallest Missing Integer Greater Than Sequential Prefix Sum | Easy | ArrayHash TableSorting |
| 403 | Smallest Palindromic Rearrangement I | Medium | StringSortingCounting Sort |
| 404 | Smallest Range Covering Elements from K Lists | Hard | ArrayHash TableGreedy |
| 405 | Smallest Range II | Medium | ArrayMathGreedy |
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