Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 837. New 21 Game | Medium | 20.1% | TopicsMathDynamic ProgrammingSliding WindowProbability and Statistics |
| 3197. Find the Minimum Area to Cover All Ones II | Hard | 20.1% | TopicsArrayMatrixEnumeration |
| 3648. Minimum Sensors to Cover Grid | Medium | 20.1% | TopicsMath |
| Maximum Calories Burnt from Jumps | Medium | 20.1% | TopicsArrayTwo PointersGreedySorting |
| 3767. Maximize Points After Choosing K Tasks | Medium | 20.1% | TopicsArrayGreedySortingHeap (Priority Queue) |
| 3781. Maximum Score After Binary Swaps | Medium | 20.1% | TopicsArrayStringGreedyHeap (Priority Queue) |
| 3794. Reverse String Prefix | Easy | 20.1% | TopicsTwo PointersString |
| 3864. Minimum Cost to Partition a Binary String | Hard | 20.1% | TopicsStringDivide and ConquerPrefix Sum |
| 3952. Maximum Total Value of Covered Indices | Medium | 20.1% | TopicsArrayStringDynamic ProgrammingGreedy |
| 3976. Maximum Subarray Sum After Multiplier | Medium | 20.1% | TopicsArrayDynamic Programming |
| 2271. Maximum White Tiles Covered by a Carpet | Medium | 20.1% | TopicsArrayBinary SearchGreedySliding WindowSortingPrefix Sum |
| 3998. Transform Binary String Using Subsequence Sort | Medium | 20.1% | TopicsArrayTwo PointersStringGreedy |
| Trips and Users | Hard | 18% | TopicsDatabase |
| Perfect Squares | Medium | 18% | TopicsMathDynamic ProgrammingBreadth-First SearchKnapsack ProblemComplete Knapsack |
| Remove Invalid Parentheses | Hard | 18% | TopicsStringBacktrackingBreadth-First Search |
| 309. Best Time to Buy and Sell Stock with Cooldown | Medium | 18% | TopicsArrayDynamic Programming |
| Wiggle Sort II | Medium | 18% | TopicsArrayDivide and ConquerGreedySortingQuickselect |
| 342. Power of Four | Easy | 18% | TopicsMathBit ManipulationRecursion |
| 374. Guess Number Higher or Lower | Easy | 18% | TopicsBinary SearchInteractive |
| 377. Combination Sum IV | Medium | 18% | TopicsArrayDynamic Programming |
| 581. Shortest Unsorted Continuous Subarray | Medium | 18% | TopicsArrayTwo PointersStackGreedySortingMonotonic Stack |
| Friend Requests II: Who Has the Most Friends | Medium | 18% | TopicsDatabase |
| Not Boring Movies | Easy | 18% | TopicsDatabase |
| 2 Keys Keyboard | Medium | 18% | TopicsMathDynamic Programming |
| 759. Employee Free Time | Hard | 18% | TopicsArraySweep LineSortingHeap (Priority Queue) |
