Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 387. First Unique Character in a String | Easy | 55% | TopicsHash TableStringQueueCounting |
| Next Greater Element II | Medium | 55% | TopicsArrayStackMonotonic Stack |
| 863. All Nodes Distance K in Binary Tree | Medium | 55% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchBinary Tree |
| String to Integer (atoi) | Medium | 54.8% | TopicsString |
| 27. Remove Element | Easy | 54.8% | TopicsArrayTwo Pointers |
| 73. Set Matrix Zeroes | Medium | 54.8% | TopicsArrayHash TableMatrix |
| 102. Binary Tree Level Order Traversal | Medium | 54.8% | TopicsTreeBreadth-First SearchBinary Tree |
| 10. Regular Expression Matching | Hard | 54.5% | TopicsStringDynamic ProgrammingRecursion |
| 25. Reverse Nodes in k-Group | Hard | 54.5% | TopicsLinked ListRecursion |
| 98. Validate Binary Search Tree | Medium | 54.5% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| 143. Reorder List | Medium | 54.5% | TopicsLinked ListTwo PointersStackRecursion |
| 443. String Compression | Medium | 54.5% | TopicsTwo PointersString |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 54.2% | TopicsTreeBreadth-First SearchBinary Tree |
| Split Array Largest Sum | Hard | 54.2% | TopicsArrayBinary SearchDynamic ProgrammingGreedyPrefix Sum |
| LFU Cache | Hard | 54.2% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Recyclable and Low Fat Products | Easy | 54.2% | TopicsDatabase |
| Create Hello World Function | Easy | 53.9% | Topics— |
| 268. Missing Number | Easy | 53.6% | TopicsArrayHash TableMathBinary SearchBit ManipulationSorting |
| 733. Flood Fill | Easy | 53.6% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| 12. Integer to Roman | Medium | 53.3% | TopicsHash TableMathString |
| Candy | Hard | 53.3% | TopicsArrayGreedy |
| 141. Linked List Cycle | Easy | 53.3% | TopicsHash TableLinked ListTwo PointersFloyd's Cycle Finding Algorithm |
| 152. Maximum Product Subarray | Medium | 53.3% | TopicsArrayDynamic Programming |
| Odd Even Linked List | Medium | 53.3% | TopicsLinked List |
| 19. Remove Nth Node From End of List | Medium | 53% | TopicsLinked ListTwo Pointers |
