Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Adjacent Increasing Subarrays Detection I | Easy | Array |
| 17 | Adjacent Increasing Subarrays Detection II | Medium | ArrayBinary Search |
| 18 | Advantage Shuffle | Medium | ArrayTwo PointersGreedy |
| 19 | Alert Using Same Key-Card Three or More Times in a One Hour Period | Medium | ArrayHash TableString |
| 20 | Alien Dictionary | Hard | ArrayStringDepth-First Search |
| 21 | All Divisions With the Highest Score of a Binary Array | Medium | Array |
| 22 | Allocate Mailboxes | Hard | ArrayMathDynamic Programming |
| 23 | Alt and Tab Simulation | Medium | ArrayHash TableSimulation |
| 24 | Alternating Groups I | Easy | ArraySliding Window |
| 25 | Alternating Groups II | Medium | ArraySliding Window |
| 26 | Alternating Groups III | Hard | ArrayBinary Indexed TreeOrdered Set |
| 27 | Amount of New Area Painted Each Day | Hard | ArraySegment TreeOrdered Set |
| 28 | Analyze User Website Visit Pattern | Medium | ArrayHash TableString |
| 29 | Ant on the Boundary | Easy | ArraySimulationPrefix Sum |
| 30 | Append K Integers With Minimal Sum | Medium | ArrayMathGreedy |
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