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51 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Flatten 2D Vector | Medium | 93.7% | TopicsArrayTwo PointersDesignIterator |
| Alien Dictionary | Hard | 93.7% | TopicsArrayStringDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| Best Meeting Point | Hard | 93.7% | TopicsArrayMathSortingMatrix |
| Design Skiplist | Hard | 93.7% | TopicsLinked ListDesign |
| 323. Number of Connected Components in an Undirected Graph | Medium | 93.7% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
| Kth Smallest Element in a Sorted Matrix | Medium | 93.7% | TopicsArrayBinary SearchSortingHeap (Priority Queue)Matrix |
| Insert Delete GetRandom O(1) | Medium | 93.7% | TopicsArrayHash TableMathDesignRandomized |
| Trapping Rain Water II | Hard | 93.7% | TopicsArrayBreadth-First SearchHeap (Priority Queue)Matrix |
| 1347. Minimum Number of Steps to Make Two Strings Anagram | Medium | 93.7% | TopicsHash TableStringCounting |
| Validate IP Address | Medium | 93.7% | TopicsString |
| Count Student Number in Departments | Medium | 93.7% | TopicsDatabase |
| Rectangles Area | Medium | 93.7% | TopicsDatabase |
| Investments in 2016 | Medium | 93.7% | TopicsDatabase |
| Customer Placing the Largest Number of Orders | Easy | 93.7% | TopicsDatabase |
| Tree Node | Medium | 93.7% | TopicsDatabase |
| 2768. Number of Black Blocks | Medium | 93.7% | TopicsArrayHash TableEnumeration |
| 831. Masking Personal Information | Medium | 93.7% | TopicsString |
| 1797. Design Authentication Manager | Medium | 93.7% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 1785. Minimum Elements to Add to Form a Given Sum | Medium | 93.7% | TopicsArrayGreedy |
| 868. Binary Gap | Easy | 93.7% | TopicsBit Manipulation |
| 1817. Finding the Users Active Minutes | Medium | 93.7% | TopicsArrayHash Table |
| 1882. Process Tasks Using Servers | Medium | 93.7% | TopicsArrayHeap (Priority Queue) |
| 1910. Remove All Occurrences of a Substring | Medium | 93.7% | TopicsStringStackSimulation |
| 1905. Count Sub Islands | Medium | 93.7% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 764. Largest Plus Sign | Medium | 66.1% | TopicsArrayDynamic Programming |
