Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Best Time to Buy and Sell Stock IV | Hard | ArrayDynamic Programming |
| 77 | Best Time to Buy and Sell Stock V | Medium | ArrayDynamic Programming |
| 78 | Best Time to Buy and Sell Stock with Cooldown | Medium | ArrayDynamic Programming |
| 79 | Best Time to Buy and Sell Stock with Transaction Fee | Medium | ArrayDynamic ProgrammingGreedy |
| 80 | Binary Prefix Divisible By 5 | Easy | ArrayBit Manipulation |
| 81 | Binary Search | Easy | ArrayBinary Search |
| 82 | Binary Searchable Numbers in an Unsorted Array | Medium | ArrayBinary Search |
| 83 | Binary Subarrays With Sum | Medium | ArrayHash TableSliding Window |
| 84 | Binary Trees With Factors | Medium | ArrayHash TableDynamic Programming |
| 85 | Bitwise OR of Adjacent Elements | Easy | ArrayBit Manipulation |
| 86 | Bitwise OR of All Subsequence Sums | Medium | ArrayMathBit Manipulation |
| 87 | Bitwise ORs of Subarrays | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 88 | Bitwise XOR of All Pairings | Medium | ArrayBit ManipulationBrainteaser |
| 89 | Block Placement Queries | Hard | ArrayBinary SearchBinary Indexed Tree |
| 90 | Boats to Save People | Medium | ArrayTwo PointersGreedy |
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