Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Count the Number of Beautiful Subarrays | Medium | ArrayHash TableBit Manipulation |
| 32 | Count the Number of Houses at a Certain Distance I | Medium | Breadth-First SearchGraphPrefix Sum |
| 33 | Count the Number of Houses at a Certain Distance II | Hard | GraphPrefix Sum |
| 34 | Count Triplets That Can Form Two Arrays of Equal XOR | Medium | ArrayHash TableMath |
| 35 | Count Vowel Strings in Ranges | Medium | ArrayStringPrefix Sum |
| 36 | Delivering Boxes from Storage to Ports | Hard | ArrayDynamic ProgrammingSegment Tree |
| 37 | Describe the Painting | Medium | ArrayHash TableSorting |
| 38 | Divide Intervals Into Minimum Number of Groups | Medium | ArrayTwo PointersGreedy |
| 39 | Equal Sum Grid Partition I | Medium | ArrayMatrixEnumeration |
| 40 | Equal Sum Grid Partition II | Hard | ArrayHash TableMatrix |
| 41 | Find All Good Indices | Medium | ArrayDynamic ProgrammingPrefix Sum |
| 42 | Find All Possible Stable Binary Arrays I | Medium | Dynamic ProgrammingPrefix Sum |
| 43 | Find All Possible Stable Binary Arrays II | Hard | Dynamic ProgrammingPrefix Sum |
| 44 | Find Good Days to Rob the Bank | Medium | ArrayDynamic ProgrammingPrefix Sum |
| 45 | Find Kth Largest XOR Coordinate Value | Medium | ArrayDivide and ConquerBit Manipulation |
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