Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 616 | Find Unique Binary String | Medium | ArrayHash TableString |
| 617 | Find Valid Matrix Given Row and Column Sums | Medium | ArrayGreedyMatrix |
| 618 | Find Weighted Median Node in Tree | Hard | ArrayBinary SearchDynamic Programming |
| 619 | Find Winner on a Tic Tac Toe Game | Easy | ArrayHash TableMatrix |
| 620 | Find Words Containing Character | Easy | ArrayString |
| 621 | Find Words That Can Be Formed by Characters | Easy | ArrayHash TableString |
| 622 | Find X-Sum of All K-Long Subarrays I | Easy | ArrayHash TableSliding Window |
| 623 | Find X-Sum of All K-Long Subarrays II | Hard | ArrayHash TableSliding Window |
| 624 | Find X Value of Array I | Medium | ArrayMathDynamic Programming |
| 625 | Find X Value of Array II | Hard | ArrayMathSegment Tree |
| 626 | Find Xor-Beauty of Array | Medium | ArrayMathBit Manipulation |
| 627 | Find XOR Sum of All Pairs Bitwise AND | Hard | ArrayMathBit Manipulation |
| 628 | Finding 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 629 | Finding Pairs With a Certain Sum | Medium | ArrayHash TableDesign |
| 630 | Finding the Number of Visible Mountains | Medium | ArrayStackSorting |
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