Practice problems across 75+ categories
Practice problems frequently asked at Counting • 166 problems | 58 Easy | 87 Medium | 20 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 32 | Count Special Triplets | Medium | ArrayHash TableCounting |
| 33 | Count Substrings Starting and Ending with Given Character | Medium | MathStringCounting |
| 34 | Count Tested Devices After Test Operations | Easy | ArraySimulationCounting |
| 35 | Count the Number of Consistent Strings | Easy | ArrayHash TableString |
| 36 | Count the Number of Good Subsequences | Medium | Hash TableMathString |
| 37 | Count the Number of Vowel Strings in Range | Easy | ArrayStringCounting |
| 38 | Design Parking System | Easy | DesignSimulationCounting |
| 39 | Destroy Sequential Targets | Medium | ArrayHash TableCounting |
| 40 | Detect Squares | Medium | ArrayHash TableDesign |
| 41 | Determine if String Halves Are Alike | Easy | StringCounting |
| 42 | Determine if Two Strings Are Close | Medium | Hash TableStringSorting |
| 43 | Distant Barcodes | Medium | ArrayHash TableGreedy |
| 44 | Divide Array Into Equal Pairs | Easy | ArrayHash TableBit Manipulation |
| 45 | Divide Array Into Increasing Sequences | Hard | ArrayCounting |
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