Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 421 | Earliest Second to Mark Indices I | Medium | ArrayBinary Search |
| 422 | Earliest Second to Mark Indices II | Hard | ArrayBinary SearchGreedy |
| 423 | Eat Pizzas! | Medium | ArrayGreedySorting |
| 424 | Element Appearing More Than 25% In Sorted Array | Easy | Array |
| 425 | Elements in Array After Removing and Replacing Elements | Medium | Array |
| 426 | Eliminate Maximum Number of Monsters | Medium | ArrayGreedySorting |
| 427 | Employee Free Time | Hard | ArrayLine SweepSorting |
| 428 | Employee Importance | Medium | ArrayHash TableTree |
| 429 | Encode and Decode Strings | Medium | ArrayStringDesign |
| 430 | Encrypt and Decrypt Strings | Hard | ArrayHash TableString |
| 431 | Equal Row and Column Pairs | Medium | ArrayHash TableMatrix |
| 432 | Equal Sum Arrays With Minimum Number of Operations | Medium | ArrayHash TableGreedy |
| 433 | Equal Sum Grid Partition I | Medium | ArrayMatrixEnumeration |
| 434 | Equal Sum Grid Partition II | Hard | ArrayHash TableMatrix |
| 435 | Erect the Fence | Hard | ArrayMathGeometry |
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