Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Average Time of Process per Machine | Easy | 41.5% | TopicsDatabase |
| 2221. Find Triangular Sum of an Array | Medium | 41.5% | TopicsArrayMathSimulationCombinatoricsNumber Theory |
| Count and Say | Medium | 40.9% | TopicsString |
| 63. Unique Paths II | Medium | 40.9% | TopicsArrayDynamic ProgrammingMatrix |
| 94. Binary Tree Inorder Traversal | Easy | 40.9% | TopicsStackTreeDepth-First SearchBinary Tree |
| Convert Sorted Array to Binary Search Tree | Easy | 40.9% | TopicsArrayDivide and ConquerTreeBinary Search TreeBinary Tree |
| 392. Is Subsequence | Easy | 40.9% | TopicsTwo PointersStringDynamic Programming |
| 647. Palindromic Substrings | Medium | 40.9% | TopicsTwo PointersStringDynamic Programming |
| 752. Open the Lock | Medium | 40.9% | TopicsArrayHash TableStringBreadth-First SearchBidirectional Search |
| 703. Kth Largest Element in a Stream | Easy | 40.9% | TopicsTreeDesignBinary Search TreeHeap (Priority Queue)Binary TreeData Stream |
| 909. Snakes and Ladders | Medium | 40.9% | TopicsArrayBreadth-First SearchMatrix |
| 1192. Critical Connections in a Network | Hard | 40.9% | TopicsDepth-First SearchGraph TheoryBiconnected ComponentBridge (Graph) |
| 1539. Kth Missing Positive Number | Easy | 40.9% | TopicsArrayBinary Search |
| 97. Interleaving String | Medium | 40.2% | TopicsStringDynamic Programming |
| 133. Clone Graph | Medium | 40.2% | TopicsHash TableDepth-First SearchBreadth-First SearchGraph Theory |
| Assign Cookies | Easy | 40.2% | TopicsArrayTwo PointersGreedySortingQuicksort |
| 542. 01 Matrix | Medium | 40.2% | TopicsArrayDynamic ProgrammingBreadth-First SearchMatrix |
| Lowest Common Ancestor of a Binary Tree III | Medium | 40.2% | TopicsHash TableTwo PointersTreeBinary TreeBinary LiftingLowest Common Ancestor |
| 2104. Sum of Subarray Ranges | Medium | 40.2% | TopicsArrayStackMonotonic Stack |
| 2281. Sum of Total Strength of Wizards | Hard | 40.2% | TopicsArrayStackMonotonic StackPrefix Sum |
| Russian Doll Envelopes | Hard | 39.6% | TopicsArrayBinary SearchDynamic ProgrammingSortingLongest Increasing Subsequence |
| 355. Design Twitter | Medium | 39.6% | TopicsHash TableLinked ListDesignHeap (Priority Queue) |
| Longest Palindromic Subsequence | Medium | 39.6% | TopicsStringDynamic Programming |
| Big Countries | Easy | 39.6% | TopicsDatabase |
| 695. Max Area of Island | Medium | 39.6% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
