Practice problems across 75+ categories
Practice problems frequently asked at Sorting • 464 problems | 89 Easy | 273 Medium | 101 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Find the Maximum Number of Marked Indices | Medium | ArrayTwo PointersBinary Search |
| 122 | Find the Maximum Sum of Node Values | Hard | ArrayDynamic ProgrammingGreedy |
| 123 | Find the Number of Ways to Place People I | Medium | ArrayMathGeometry |
| 124 | Find the Number of Ways to Place People II | Hard | ArrayMathGeometry |
| 125 | Find the Sum of Subsequence Powers | Hard | ArrayDynamic ProgrammingSorting |
| 126 | Find the Value of the Partition | Medium | ArraySorting |
| 127 | Finding 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 128 | Finding the Number of Visible Mountains | Medium | ArrayStackSorting |
| 129 | Frequency of the Most Frequent Element | Medium | ArrayBinary SearchGreedy |
| 130 | Friends Of Appropriate Ages | Medium | ArrayTwo PointersBinary Search |
| 131 | GCD Sort of an Array | Hard | ArrayMathUnion Find |
| 132 | Get Biggest Three Rhombus Sums in a Grid | Medium | ArrayMathSorting |
| 133 | Get Watched Videos by Your Friends | Medium | ArrayHash TableBreadth-First Search |
| 134 | Greatest Sum Divisible by Three | Medium | ArrayDynamic ProgrammingGreedy |
| 135 | Group Anagrams | Medium | ArrayHash TableString |
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