Amazon
2015 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 572. Subtree of Another Tree | Easy | 26.6% | TopicsTreeDepth-First SearchString MatchingBinary TreeHash Function |
| Exchange Seats | Medium | 26.6% | TopicsDatabase |
| 684. Redundant Connection | Medium | 26.6% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
| 819. Most Common Word | Easy | 26.6% | TopicsArrayHash TableStringCounting |
| 851. Loud and Rich | Medium | 26.6% | TopicsArrayDepth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| 1166. Design File System | Medium | 26.6% | TopicsHash TableStringDesignTrie |
| Actors and Directors Who Cooperated At Least Three Times | Easy | 26.6% | TopicsDatabase |
| Sales Analysis III | Easy | 26.6% | TopicsDatabase |
| 1129. Shortest Path with Alternating Colors | Medium | 26.6% | TopicsBreadth-First SearchGraph Theory |
| 1155. Number of Dice Rolls With Target Sum | Medium | 26.6% | TopicsDynamic Programming |
| Reformat Department Table | Easy | 26.6% | TopicsDatabase |
| Queries Quality and Percentage | Easy | 26.6% | TopicsDatabase |
| 1255. Maximum Score Words Formed by Letters | Hard | 26.6% | TopicsArrayHash TableStringDynamic ProgrammingBacktrackingBit ManipulationCountingBitmask |
| 1311. Get Watched Videos by Your Friends | Medium | 26.6% | TopicsArrayHash TableBreadth-First SearchGraph TheorySorting |
| 1358. Number of Substrings Containing All Three Characters | Medium | 26.6% | TopicsHash TableStringSliding Window |
| List the Products Ordered in a Period | Easy | 26.6% | TopicsDatabase |
| 1498. Number of Subsequences That Satisfy the Given Sum Condition | Medium | 26.6% | TopicsArrayTwo PointersBinary SearchSorting |
| 1574. Shortest Subarray to be Removed to Make Array Sorted | Medium | 26.6% | TopicsArrayTwo PointersBinary SearchStackMonotonic Stack |
| 1614. Maximum Nesting Depth of the Parentheses | Easy | 26.6% | TopicsStringStackBracket Sequences |
| 1631. Path With Minimum Effort | Medium | 26.6% | TopicsArrayBinary SearchDepth-First SearchBreadth-First SearchUnion-FindHeap (Priority Queue)MatrixDijkstra's Algorithm |
| 1695. Maximum Erasure Value | Medium | 26.6% | TopicsArrayHash TableSliding Window |
| 1723. Find Minimum Time to Finish All Jobs | Hard | 26.6% | TopicsArrayDynamic ProgrammingBacktrackingBit ManipulationBitmask |
| 1903. Largest Odd Number in String | Easy | 26.6% | TopicsMathStringGreedy |
| 1920. Build Array from Permutation | Easy | 26.6% | TopicsArraySimulation |
| 1998. GCD Sort of an Array | Hard | 26.6% | TopicsArrayMathUnion-FindSortingNumber TheoryPrime FactorizationEuclidean AlgorithmGreatest Common Divisor |
