Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 854. K-Similar Strings | Hard | 5% | TopicsHash TableStringBreadth-First Search |
| Student Attendance Record I | Easy | 5% | TopicsString |
| 2670. Find the Distinct Difference Array | Easy | 5% | TopicsArrayHash Table |
| 823. Binary Trees With Factors | Medium | 5% | TopicsArrayHash TableDynamic ProgrammingSorting |
| 3691. Maximum Total Subarray Value II | Hard | 5% | TopicsArrayGreedySegment TreeHeap (Priority Queue) |
| 1441. Build an Array With Stack Operations | Medium | 5% | TopicsArrayStackSimulation |
| 3412. Find Mirror Score of a String | Medium | 5% | TopicsHash TableStringStackSimulation |
| Kth Smallest Number in Multiplication Table | Hard | 5% | TopicsMathBinary Search |
| 3559. Number of Ways to Assign Edge Weights II | Hard | 5% | TopicsArrayMathDynamic ProgrammingBit ManipulationTreeDepth-First Search |
| 3469. Find Minimum Cost to Remove Array Elements | Medium | 5% | TopicsArrayDynamic Programming |
| 1005. Maximize Sum Of Array After K Negations | Easy | 5% | TopicsArrayGreedySorting |
| 1987. Number of Unique Good Subsequences | Hard | 5% | TopicsStringDynamic Programming |
| 3700. Number of ZigZag Arrays II | Hard | 5% | TopicsMathDynamic Programming |
| 2603. Collect Coins in a Tree | Hard | 5% | TopicsArrayTreeGraph TheoryTopological Sort |
| 914. X of a Kind in a Deck of Cards | Easy | 5% | TopicsArrayHash TableMathCountingNumber TheoryEuclidean AlgorithmGreatest Common Divisor |
| First and Last Call On the Same Day | Hard | 5% | TopicsDatabase |
| 3901. Good Subsequence Queries | Hard | 5% | TopicsArrayMathSegment TreeNumber Theory |
| 3000. Maximum Area of Longest Diagonal Rectangle | Easy | 5% | TopicsArray |
| Count Numbers with Unique Digits | Medium | 5% | TopicsMathDynamic ProgrammingBacktracking |
| 1797. Design Authentication Manager | Medium | 5% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Decode Ways II | Hard | 5% | TopicsStringDynamic Programming |
| 1301. Number of Paths with Max Score | Hard | 5% | TopicsArrayDynamic ProgrammingMatrix |
| 1905. Count Sub Islands | Medium | 5% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 864. Shortest Path to Get All Keys | Hard | 5% | TopicsArrayBit ManipulationBreadth-First SearchMatrix |
| Wiggle Subsequence | Medium | 5% | TopicsArrayDynamic ProgrammingGreedy |
