Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2686 | Range XOR Queries with Subarray Reversals | Hard | ArrayTreeBinary Tree |
| 2687 | Rank Teams by Votes | Medium | ArrayHash TableString |
| 2688 | Rank Transform of a Matrix | Hard | ArrayUnion FindGraph |
| 2689 | Rank Transform of an Array | Easy | ArrayHash TableSorting |
| 2690 | Ransom Note | Easy | Hash TableStringCounting |
| 2691 | Reach a Number | Medium | MathBinary Search |
| 2692 | Reach End of Array With Max Score | Medium | ArrayGreedy |
| 2693 | Reachable Nodes In Subdivided Graph | Hard | GraphHeap (Priority Queue)Shortest Path |
| 2694 | Reachable Nodes With Restrictions | Medium | ArrayHash TableTree |
| 2695 | Reaching Points | Hard | Math |
| 2696 | Read N Characters Given Read4 | Easy | ArraySimulationInteractive |
| 2697 | Read N Characters Given read4 II - Call Multiple Times | Hard | ArraySimulationInteractive |
| 2698 | Rearrange Array Elements by Sign | Medium | ArrayTwo PointersSimulation |
| 2699 | Rearrange Array to Maximize Prefix Score | Medium | ArrayGreedySorting |
| 2700 | Rearrange Characters to Make Target String | Easy | Hash TableStringCounting |
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