Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2716 | Redistribute Characters to Make All Strings Equal | Easy | Hash TableStringCounting |
| 2717 | Reduce Array Size to The Half | Medium | ArrayHash TableGreedy |
| 2718 | Reducing Dishes | Easy | ArrayDynamic ProgrammingGreedy |
| 2719 | Reduction Operations to Make the Array Elements Equal | Medium | ArraySorting |
| 2720 | Redundant Connection | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 2721 | Reformat Date | Easy | String |
| 2722 | Reformat Department Table | Easy | Database |
| 2723 | Reformat Phone Number | Easy | String |
| 2724 | Reformat The String | Easy | String |
| 2725 | Regions Cut By Slashes | Medium | ArrayHash TableDepth-First Search |
| 2726 | Regular Expression Matching | Hard | StringDynamic ProgrammingRecursion |
| 2727 | Relative Ranks | Easy | ArraySortingHeap (Priority Queue) |
| 2728 | Relative Sort Array | Easy | ArrayHash TableSorting |
| 2729 | Relocate Marbles | Medium | ArrayHash TableSorting |
| 2730 | Remove 9 | Hard | Math |
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