Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 841 | Longest Unequal Adjacent Groups Subsequence I | Easy | ArrayStringDynamic Programming |
| 842 | Longest Unequal Adjacent Groups Subsequence II | Medium | ArrayStringDynamic Programming |
| 843 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
| 844 | Longest Winning Streak | Hard | DatabaseHash TableSliding Window |
| 845 | Longest Word in Dictionary | Medium | ArrayHash TableString |
| 846 | Longest Word in Dictionary through Deleting | Medium | ArrayTwo PointersString |
| 847 | Longest Word With All Prefixes | Medium | ArrayStringDepth-First Search |
| 848 | Loud and Rich | Medium | ArrayDepth-First SearchGraph |
| 849 | Lucky Numbers in a Matrix | Easy | ArrayMatrix |
| 850 | Magic Squares In Grid | Medium | ArrayHash TableMath |
| 851 | Magnetic Force Between Two Balls | Medium | ArrayBinary SearchSorting |
| 852 | Majority Element | Easy | ArrayHash TableDivide and Conquer |
| 853 | Majority Element II | Medium | ArrayHash TableSorting |
| 854 | Make a Positive Array | Medium | ArrayGreedyPrefix Sum |
| 855 | Make a Square with the Same Color | Easy | ArrayMatrixEnumeration |
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