2324 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 2981. Find Longest Special Substring That Occurs Thrice I | Medium | 23.4% | TopicsHash TableStringBinary SearchSliding WindowCounting |
| Construct Binary Tree from Inorder and Postorder Traversal | Medium | 23.4% | TopicsArrayHash TableDivide and ConquerTreeBinary Tree |
| 2251. Number of Flowers in Full Bloom | Hard | 23.4% | TopicsArrayHash TableBinary SearchSortingPrefix SumOrdered Set |
| 2407. Longest Increasing Subsequence II | Hard | 23.4% | TopicsArrayDivide and ConquerDynamic ProgrammingBinary Indexed TreeSegment TreeQueueMonotonic Queue |
| Number of Atoms | Hard | 23.4% | TopicsHash TableStringStackSorting |
| 1000. Minimum Cost to Merge Stones | Hard | 23.4% | TopicsArrayDynamic ProgrammingPrefix Sum |
| 3201. Find the Maximum Length of Valid Subsequence I | Medium | 23.4% | TopicsArrayDynamic Programming |
| 1582. Special Positions in a Binary Matrix | Easy | 23.4% | TopicsArrayMatrix |
| 1614. Maximum Nesting Depth of the Parentheses | Easy | 23.4% | TopicsStringStackBracket Sequences |
| 1642. Furthest Building You Can Reach | Medium | 23.4% | TopicsArrayGreedyHeap (Priority Queue) |
| 1721. Swapping Nodes in a Linked List | Medium | 23.4% | TopicsLinked ListTwo Pointers |
| 1976. Number of Ways to Arrive at Destination | Medium | 23.4% | TopicsDynamic ProgrammingGraph TheoryTopological SortShortest PathDijkstra's Algorithm |
| 860. Lemonade Change | Easy | 23.4% | TopicsArrayGreedy |
| 3350. Adjacent Increasing Subarrays Detection II | Medium | 23.4% | TopicsArrayBinary Search |
| 1975. Maximum Matrix Sum | Medium | 23.4% | TopicsArrayGreedyMatrix |
| 355. Design Twitter | Medium | 23.4% | TopicsHash TableLinked ListDesignHeap (Priority Queue) |
| 3440. Reschedule Meetings for Maximum Free Time II | Medium | 23.4% | TopicsArrayGreedyEnumeration |
| 1415. The k-th Lexicographical String of All Happy Strings of Length n | Medium | 23.4% | TopicsStringBacktracking |
| 2104. Solving Questions With Brainpower | Medium | 23.4% | TopicsArrayDynamic Programming |
| 3507. Minimum Pair Removal to Sort Array I | Easy | 23.4% | TopicsArrayHash TableLinked ListHeap (Priority Queue)SimulationDoubly-Linked ListOrdered Set |
| Department Highest Salary | Medium | 23.4% | TopicsDatabase |
| 3731. Find Missing Elements | Easy | 23.4% | TopicsArrayHash TableSorting |
| N-Queens II | Hard | 22.3% | TopicsBacktrackingAlgorithm X |
| 323. Number of Connected Components in an Undirected Graph | Medium | 22.3% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
| 393. UTF-8 Validation | Medium | 22.3% | TopicsArrayBit Manipulation |
