Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1426 | Number of Nodes With Value One | Medium | ArrayTreeDepth-First Search |
| 1427 | Number of Orders in the Backlog | Medium | ArrayHeap (Priority Queue)Simulation |
| 1428 | Number of Pairs of Interchangeable Rectangles | Medium | ArrayHash TableMath |
| 1429 | Number of Pairs of Strings With Concatenation Equal to Target | Medium | ArrayHash TableString |
| 1430 | Number of Pairs Satisfying Inequality | Hard | ArrayBinary SearchDivide and Conquer |
| 1431 | Number of Paths with Max Score | Hard | ArrayDynamic ProgrammingMatrix |
| 1432 | Number of People That Can Be Seen in a Grid | Medium | ArrayStackMatrix |
| 1433 | Number Of Rectangles That Can Form The Largest Square | Easy | Array |
| 1434 | Number of Same-End Substrings | Medium | ArrayHash TableString |
| 1435 | Number of Self-Divisible Permutations | Medium | ArrayMathDynamic Programming |
| 1436 | Number of Senior Citizens | Easy | ArrayString |
| 1437 | Number of Ships in a Rectangle | Hard | ArrayDivide and ConquerInteractive |
| 1438 | Number of Smooth Descent Periods of a Stock | Medium | ArrayMathTwo Pointers |
| 1439 | Number of Spaces Cleaning Robot Cleaned | Medium | ArrayMatrixSimulation |
| 1440 | Number of Squareful Arrays | Hard | ArrayHash TableMath |
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