Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1396 | Next Permutation | Medium | ArrayTwo Pointers |
| 1397 | Non-decreasing Array | Medium | Array |
| 1398 | Non-decreasing Subsequences | Medium | ArrayHash TableBacktracking |
| 1399 | Non-overlapping Intervals | Medium | ArrayDynamic ProgrammingGreedy |
| 1400 | Number of Adjacent Elements With the Same Color | Medium | Array |
| 1401 | Number of Arithmetic Triplets | Easy | ArrayHash TableTwo Pointers |
| 1402 | Number of Beautiful Pairs | Easy | ArrayHash TableMath |
| 1403 | Number of Black Blocks | Medium | ArrayHash TableEnumeration |
| 1404 | Number of Boomerangs | Medium | ArrayHash TableMath |
| 1405 | Number of Closed Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 1406 | Number Of Corner Rectangles | Medium | ArrayMathDynamic Programming |
| 1407 | Number of Different Subsequences GCDs | Hard | ArrayMathCounting |
| 1408 | Number of Distinct Averages | Easy | ArrayHash TableTwo Pointers |
| 1409 | Number of Divisible Triplet Sums | Medium | ArrayHash Table |
| 1410 | Number of Employees Who Met the Target | Easy | Array |
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