Practice problems across 75+ categories
Practice problems frequently asked at Sorting • 464 problems | 89 Easy | 273 Medium | 101 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | 3Sum | Medium | ArrayTwo PointersSorting |
| 2 | 3Sum Closest | Medium | ArrayTwo PointersSorting |
| 3 | 3Sum Smaller | Medium | ArrayTwo PointersBinary Search |
| 4 | 3Sum With Multiplicity | Medium | ArrayHash TableTwo Pointers |
| 5 | 4Sum | Medium | ArrayTwo PointersSorting |
| 6 | Advantage Shuffle | Medium | ArrayTwo PointersGreedy |
| 7 | Alert Using Same Key-Card Three or More Times in a One Hour Period | Medium | ArrayHash TableString |
| 8 | All Elements in Two Binary Search Trees | Medium | TreeDepth-First SearchBinary Search Tree |
| 9 | Allocate Mailboxes | Hard | ArrayMathDynamic Programming |
| 10 | Analyze User Website Visit Pattern | Medium | ArrayHash TableString |
| 11 | Append K Integers With Minimal Sum | Medium | ArrayMathGreedy |
| 12 | Apple Redistribution into Boxes | Easy | ArrayGreedySorting |
| 13 | Apply Operations to Make String Empty | Medium | ArrayHash TableSorting |
| 14 | Apply Operations to Maximize Frequency Score | Hard | ArrayBinary SearchSliding Window |
| 15 | Apply Operations to Maximize Score | Hard | ArrayMathStack |
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