Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 286 | Count Prime-Gap Balanced Subarrays | Medium | ArrayMathQueue |
| 287 | Count Primes | Medium | ArrayMathEnumeration |
| 288 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 289 | Count Special Quadruplets | Easy | ArrayHash TableEnumeration |
| 290 | Count Special Subsequences | Medium | ArrayHash TableMath |
| 291 | Count Special Triplets | Medium | ArrayHash TableCounting |
| 292 | Count Square Submatrices with All Ones | Medium | ArrayDynamic ProgrammingMatrix |
| 293 | Count Strictly Increasing Subarrays | Medium | ArrayMathDynamic Programming |
| 294 | Count Strings With Required Characters | Easy | ArrayHash TableString |
| 295 | Count Students Who Completed All Assignments | Easy | ArrayHash TableCounting |
| 296 | Count Sub Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 297 | Count Subarrays of Length Three With a Condition | Easy | Array |
| 298 | Count Subarrays Where Max Element Appears at Least K Times | Medium | ArraySliding Window |
| 299 | Count Subarrays With Fixed Bounds | Hard | ArrayQueueSliding Window |
| 300 | Count Subarrays With Median K | Hard | ArrayHash TablePrefix Sum |
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