X
51 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 433. Minimum Genetic Mutation | Medium | 100% | TopicsHash TableStringBreadth-First SearchBidirectional Search |
| 42. Trapping Rain Water | Hard | 97% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
| 56. Merge Intervals | Medium | 97% | TopicsArraySortingQuicksort |
| 146. LRU Cache | Medium | 97% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| Flatten Nested List Iterator | Medium | 97% | TopicsStackTreeDepth-First SearchDesignQueueIterator |
| 355. Design Twitter | Medium | 97% | TopicsHash TableLinked ListDesignHeap (Priority Queue) |
| 1348. Tweet Counts Per Frequency | Medium | 97% | TopicsHash TableStringBinary SearchDesignSortingOrdered Set |
| Invalid Tweets | Easy | 97% | TopicsDatabase |
| 10. Regular Expression Matching | Hard | 93.7% | TopicsStringDynamic ProgrammingRecursion |
| 12. Integer to Roman | Medium | 93.7% | TopicsHash TableMathString |
| 20. Valid Parentheses | Easy | 93.7% | TopicsStringStackBracket Sequences |
| 23. Merge k Sorted Lists | Hard | 93.7% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| Multiply Strings | Medium | 93.7% | TopicsMathStringSimulation |
| Wildcard Matching | Hard | 93.7% | TopicsStringDynamic ProgrammingGreedyRecursion |
| Permutation Sequence | Hard | 93.7% | TopicsMathRecursion |
| 118. Pascal's Triangle | Easy | 93.7% | TopicsArrayDynamic Programming |
| Word Break II | Hard | 93.7% | TopicsArrayHash TableStringDynamic ProgrammingBacktrackingTrieMemoization |
| 2073. Time Needed to Buy Tickets | Easy | 93.7% | TopicsArrayQueueSimulation |
| Max Points on a Line | Hard | 93.7% | TopicsArrayHash TableMathGeometryEuclidean AlgorithmGreatest Common Divisor |
| One Edit Distance | Medium | 93.7% | TopicsTwo PointersString |
| 202. Happy Number | Easy | 93.7% | TopicsHash TableMathTwo PointersFloyd's Cycle Finding Algorithm |
| 206. Reverse Linked List | Easy | 93.7% | TopicsLinked ListRecursion |
| Implement Trie (Prefix Tree) | Medium | 93.7% | TopicsHash TableStringDesignTrie |
| The Skyline Problem | Hard | 93.7% | TopicsArrayDivide and ConquerBinary Indexed TreeSegment TreeSweep LineSortingHeap (Priority Queue)Ordered Set |
| 235. Lowest Common Ancestor of a Binary Search Tree | Medium | 93.7% | TopicsTreeDepth-First SearchBinary Search TreeBinary TreeBinary LiftingLowest Common Ancestor |
