Practice problems across 75+ categories
Practice problems frequently asked at Counting • 166 problems | 58 Easy | 87 Medium | 20 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 151 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 152 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 153 | Sum of Beauty of All Substrings | Medium | Hash TableStringCounting |
| 154 | Sum of Digit Differences of All Pairs | Medium | ArrayHash TableMath |
| 155 | Sum of Prefix Scores of Strings | Hard | ArrayStringTrie |
| 156 | Sum of Unique Elements | Easy | ArrayHash TableCounting |
| 157 | Task Scheduler | Medium | ArrayHash TableGreedy |
| 158 | The Number of Good Subsets | Hard | ArrayHash TableMath |
| 159 | Top K Frequent Elements | Medium | ArrayHash TableDivide and Conquer |
| 160 | Top K Frequent Words | Medium | ArrayHash TableString |
| 161 | Total Characters in String After Transformations I | Medium | Hash TableMathString |
| 162 | Total Characters in String After Transformations II | Hard | Hash TableMathString |
| 163 | Transform Array by Parity | Easy | ArraySortingCounting |
| 164 | Tuple with Same Product | Medium | ArrayHash TableCounting |
| 165 | Uncommon Words from Two Sentences | Easy | Hash TableStringCounting |
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