Practice problems across 75+ categories
Practice problems frequently asked at Counting • 166 problems | 58 Easy | 87 Medium | 20 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Reordered Power of 2 | Medium | Hash TableMathSorting |
| 137 | Reorganize String | Medium | Hash TableStringGreedy |
| 138 | Replace Question Marks in String to Minimize Its Value | Medium | Hash TableStringGreedy |
| 139 | Right Triangles | Medium | ArrayHash TableMath |
| 140 | RLE Iterator | Medium | ArrayDesignCounting |
| 141 | Sender With Largest Word Count | Medium | ArrayHash TableString |
| 142 | Smallest Palindromic Rearrangement II | Hard | Hash TableMathString |
| 143 | Sort Characters By Frequency | Medium | Hash TableStringSorting |
| 144 | Sort Integers by The Number of 1 Bits | Easy | ArrayBit ManipulationSorting |
| 145 | Sorted GCD Pair Queries | Hard | ArrayHash TableMath |
| 146 | Split a String in Balanced Strings | Easy | StringGreedyCounting |
| 147 | Split the Array | Easy | ArrayHash TableCounting |
| 148 | Stone Game IX | Medium | ArrayMathGreedy |
| 149 | Subarrays with K Different Integers | Hard | ArrayHash TableSliding Window |
| 150 | Subdomain Visit Count | Medium | ArrayHash TableString |
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