MongoDB
25 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Implement Trie (Prefix Tree) | Medium | 100% | TopicsHash TableStringDesignTrie |
| 1146. Snapshot Array | Medium | 100% | TopicsArrayHash TableBinary SearchDesignPersistent Data Structure |
| 349. Intersection of Two Arrays | Easy | 94.5% | TopicsArrayHash TableTwo PointersBinary SearchSorting |
| 139. Word Break | Medium | 91.3% | TopicsArrayHash TableStringDynamic ProgrammingTrieMemoizationBrute-Force Search |
| 146. LRU Cache | Medium | 87.5% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Text Justification | Hard | 83.1% | TopicsArrayStringSimulation |
| Web Crawler Multithreaded | Medium | 77.6% | TopicsDepth-First SearchBreadth-First SearchConcurrency |
| Convert JSON String to Object | Hard | 77.6% | Topics— |
| 210. Course Schedule II | Medium | 77.6% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort |
| 23. Merge k Sorted Lists | Hard | 70.6% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| Design Search Autocomplete System | Hard | 70.6% | TopicsStringDepth-First SearchDesignTrieSortingHeap (Priority Queue)Data Stream |
| 981. Time Based Key-Value Store | Medium | 70.6% | TopicsHash TableStringBinary SearchDesign |
| 56. Merge Intervals | Medium | 70.6% | TopicsArraySortingQuicksort |
| 1. Two Sum | Easy | 70.6% | TopicsArrayHash Table |
| 2591. Distribute Money to Maximum Children | Easy | 70.6% | TopicsMathGreedy |
| Merge Two Binary Trees | Easy | 60.7% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 2034. Stock Price Fluctuation | Medium | 60.7% | TopicsHash TableDesignHeap (Priority Queue)Data StreamOrdered Set |
| Sliding Window Maximum | Hard | 60.7% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Monotonic QueueRange Minimum/Maximum Query |
| Lowest Common Ancestor of a Binary Tree III | Medium | 60.7% | TopicsHash TableTwo PointersTreeBinary TreeBinary LiftingLowest Common Ancestor |
| 443. String Compression | Medium | 60.7% | TopicsTwo PointersString |
| 133. Clone Graph | Medium | 60.7% | TopicsHash TableDepth-First SearchBreadth-First SearchGraph Theory |
| 165. Compare Version Numbers | Medium | 60.7% | TopicsTwo PointersString |
| 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Medium | 60.7% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Ordered SetMonotonic Queue |
| 1488. Avoid Flood in The City | Medium | 60.7% | TopicsArrayHash TableBinary SearchGreedyHeap (Priority Queue) |
| 207. Course Schedule | Medium | 60.7% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
