Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 271 | Count Prefix and Suffix Pairs I | Easy | ArrayStringTrie |
| 272 | Count Prefix and Suffix Pairs II | Hard | ArrayStringTrie |
| 273 | Count Prefixes of a Given String | Easy | ArrayString |
| 274 | Count Prime-Gap Balanced Subarrays | Medium | ArrayMathQueue |
| 275 | Count Primes | Medium | ArrayMathEnumeration |
| 276 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 277 | Count Special Quadruplets | Easy | ArrayHash TableEnumeration |
| 278 | Count Special Subsequences | Medium | ArrayHash TableMath |
| 279 | Count Special Triplets | Medium | ArrayHash TableCounting |
| 280 | Count Square Submatrices with All Ones | Medium | ArrayDynamic ProgrammingMatrix |
| 281 | Count Strictly Increasing Subarrays | Medium | ArrayMathDynamic Programming |
| 282 | Count Sub Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 283 | Count Subarrays of Length Three With a Condition | Easy | Array |
| 284 | Count Subarrays Where Max Element Appears at Least K Times | Medium | ArraySliding Window |
| 285 | Count Subarrays With Fixed Bounds | Hard | ArrayQueueSliding Window |
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.
