Practice problems across 75+ categories
Practice problems frequently asked at Prefix Sum • 208 problems | 18 Easy | 128 Medium | 61 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Ant on the Boundary | Easy | ArraySimulationPrefix Sum |
| 2 | Apply Operations to Make All Array Elements Equal to Zero | Medium | ArrayPrefix Sum |
| 3 | Apply Operations to Maximize Frequency Score | Hard | ArrayBinary SearchSliding Window |
| 4 | Array Equilibrium Index | Easy | ArraysArrayPrefix Sum |
| 5 | Binary Subarrays With Sum | Medium | ArrayHash TableSliding Window |
| 6 | Bitwise OR of All Subsequence Sums | Medium | ArrayMathBit Manipulation |
| 7 | Brightest Position on Street | Medium | ArraySortingPrefix Sum |
| 8 | Build Array Where You Can Find The Maximum Exactly K Comparisons | Hard | Dynamic ProgrammingPrefix Sum |
| 9 | Can Make Palindrome from Substring | Medium | ArrayHash TableString |
| 10 | Can You Eat Your Favorite Candy on Your Favorite Day? | Medium | ArrayPrefix Sum |
| 11 | Car Pooling | Medium | ArraySortingHeap (Priority Queue) |
| 12 | Change Minimum Characters to Satisfy One of Three Conditions | Medium | Hash TableStringCounting |
| 13 | Check if All the Integers in a Range Are Covered | Easy | ArrayHash TablePrefix Sum |
| 14 | Construct Product Matrix | Medium | ArrayMatrixPrefix Sum |
| 15 | Contiguous Array | Medium | ArrayHash TablePrefix Sum |
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