Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1561 | Random Pick with Blacklist | Hard | ArrayHash TableMath |
| 1562 | Random Pick with Weight | Medium | ArrayMathBinary Search |
| 1563 | Random Point in Non-overlapping Rectangles | Medium | ArrayMathBinary Search |
| 1564 | Range Addition | Medium | ArrayPrefix Sum |
| 1565 | Range Addition II | Easy | ArrayMath |
| 1566 | Range Frequency Queries | Medium | ArrayHash TableBinary Search |
| 1567 | Range Product Queries of Powers | Medium | ArrayBit ManipulationPrefix Sum |
| 1568 | Range Sum of Sorted Subarray Sums | Medium | ArrayTwo PointersBinary Search |
| 1569 | Range Sum Query 2D - Immutable | Medium | ArrayDesignMatrix |
| 1570 | Range Sum Query 2D - Mutable | Medium | ArrayDesignBinary Indexed Tree |
| 1571 | Range Sum Query - Immutable | Easy | ArrayDesignPrefix Sum |
| 1572 | Range Sum Query - Mutable | Easy | ArrayDivide and ConquerDesign |
| 1573 | Range XOR Queries with Subarray Reversals | Hard | ArrayTreeBinary Tree |
| 1574 | Rank Teams by Votes | Medium | ArrayHash TableString |
| 1575 | Rank Transform of a Matrix | Hard | ArrayUnion FindGraph |
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