Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 3814. Maximum Capacity Within Budget | Medium | 25.2% | TopicsArrayTwo PointersBinary SearchSorting |
| 3863. Minimum Operations to Sort a String | Medium | 25.2% | TopicsString |
| 3942. Minimum Operations to Sort a Permutation | Medium | 25.2% | TopicsArray |
| Remove Duplicates from Sorted List II | Medium | 23.6% | TopicsLinked ListTwo Pointers |
| Convert Sorted List to Binary Search Tree | Medium | 23.6% | TopicsLinked ListDivide and ConquerTreeBinary Search TreeBinary Tree |
| Reverse Words in a String II | Medium | 23.6% | TopicsTwo PointersString |
| 188. Best Time to Buy and Sell Stock IV | Hard | 23.6% | TopicsArrayDynamic Programming |
| 299. Bulls and Cows | Medium | 23.6% | TopicsHash TableStringCounting |
| 346. Moving Average from Data Stream | Easy | 23.6% | TopicsArrayDesignQueueData Stream |
| 350. Intersection of Two Arrays II | Easy | 23.6% | TopicsArrayHash TableTwo PointersBinary SearchSorting |
| 367. Valid Perfect Square | Easy | 23.6% | TopicsMathBinary Search |
| Largest Divisible Subset | Medium | 23.6% | TopicsArrayMathDynamic ProgrammingSorting |
| Sliding Window Median | Hard | 23.6% | TopicsArrayHash TableSliding WindowHeap (Priority Queue)Treap |
| Base 7 | Easy | 23.6% | TopicsMathString |
| Maximum Alternating Subarray Sum | Medium | 23.6% | TopicsArrayDynamic Programming |
| Minesweeper | Medium | 23.6% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| 532. K-diff Pairs in an Array | Medium | 23.6% | TopicsArrayHash TableTwo PointersBinary SearchSorting |
| Encode and Decode TinyURL | Medium | 23.6% | TopicsHash TableStringDesignHash Function |
| Convert BST to Greater Tree | Medium | 23.6% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| Reverse String II | Easy | 23.6% | TopicsTwo PointersString |
| Longest Harmonious Subsequence | Easy | 23.6% | TopicsArrayHash TableSliding WindowSortingCounting |
| Solve the Equation | Medium | 23.6% | TopicsMathStringSimulationLinear Algebra |
| Design Search Autocomplete System | Hard | 23.6% | TopicsStringDepth-First SearchDesignTrieSortingHeap (Priority Queue)Data Stream |
| Number of Distinct Islands II | Hard | 23.6% | TopicsArrayHash TableDepth-First SearchBreadth-First SearchUnion-FindSortingMatrixHash Function |
| Max Stack | Hard | 23.6% | TopicsLinked ListStackDesignDoubly-Linked ListOrdered Set |
