Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1891 | Two Sum | Easy | ArrayHash Table |
| 1892 | Two Sum II - Input Array Is Sorted | Medium | ArrayTwo PointersBinary Search |
| 1893 | Two Sum III - Data structure design | Easy | ArrayHash TableTwo Pointers |
| 1894 | Two Sum Less Than K | Easy | ArrayTwo PointersBinary Search |
| 1895 | Type of Triangle | Easy | ArrayMathSorting |
| 1896 | Uncrossed Lines | Medium | ArrayDynamic Programming |
| 1897 | Unique 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 1898 | Unique Email Addresses | Easy | ArrayHash TableString |
| 1899 | Unique Morse Code Words | Easy | ArrayHash TableString |
| 1900 | Unique Number of Occurrences | Easy | ArrayHash Table |
| 1901 | Unique Paths II | Medium | ArrayDynamic ProgrammingMatrix |
| 1902 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 1903 | Unique Word Abbreviation | Medium | ArrayHash TableString |
| 1904 | Unit Conversion II | Medium | ArrayMathDepth-First Search |
| 1905 | UTF-8 Validation | Medium | ArrayBit Manipulation |
Powerful online tools to boost your productivity
Coding Ground For Developers
Code, Edit, Run and ShareIgnite your coding potential on Coding Ground - an immersive online platform for hands-on learning, collaboration, and skill development.
