Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 511 | Find Missing Observations | Medium | ArrayMathSimulation |
| 512 | Find N Unique Integers Sum up to Zero | Easy | ArrayMath |
| 513 | Find Nearest Point That Has the Same X or Y Coordinate | Easy | Array |
| 514 | Find Numbers with Even Number of Digits | Easy | ArrayMath |
| 515 | Find Occurrences of an Element in an Array | Medium | ArrayHash Table |
| 516 | Find Original Array From Doubled Array | Medium | ArrayHash TableGreedy |
| 517 | Find Palindrome With Fixed Length | Medium | ArrayMath |
| 518 | Find Pattern in Infinite Stream I | Medium | ArraySliding WindowRolling Hash |
| 519 | Find Pattern in Infinite Stream II | Hard | ArraySliding WindowRolling Hash |
| 520 | Find Peak Element | Medium | ArrayBinary Search |
| 521 | Find Permutation | Medium | ArrayStringStack |
| 522 | Find Pivot Index | Easy | ArrayPrefix Sum |
| 523 | Find Players With Zero or One Losses | Medium | ArrayHash TableSorting |
| 524 | Find Polygon With the Largest Perimeter | Medium | ArrayGreedySorting |
| 525 | Find Products of Elements of Big Array | Hard | ArrayBinary SearchBit Manipulation |
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