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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1071. Greatest Common Divisor of Strings | Easy | 34.1% | TopicsMathStringEuclidean AlgorithmGreatest Common Divisor |
| 2149. Rearrange Array Elements by Sign | Medium | 34.1% | TopicsArrayTwo PointersSimulation |
| 130. Surrounded Regions | Medium | 33% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| Single Number II | Medium | 33% | TopicsArrayBit Manipulation |
| 213. House Robber II | Medium | 33% | TopicsArrayDynamic Programming |
| Binary Tree Paths | Easy | 33% | TopicsStringBacktrackingTreeDepth-First SearchBinary Tree |
| 435. Non-overlapping Intervals | Medium | 33% | TopicsArrayDynamic ProgrammingGreedySorting |
| 438. Find All Anagrams in a String | Medium | 33% | TopicsHash TableStringSliding Window |
| Number of Provinces | Medium | 33% | TopicsDepth-First SearchBreadth-First SearchUnion-FindGraph Theory |
| 572. Subtree of Another Tree | Easy | 33% | TopicsTreeDepth-First SearchString MatchingBinary TreeHash Function |
| Two Sum IV - Input is a BST | Easy | 33% | TopicsHash TableTwo PointersTreeDepth-First SearchBreadth-First SearchBinary Search TreeBinary Tree |
| 983. Minimum Cost For Tickets | Medium | 33% | TopicsArrayDynamic Programming |
| Customer Who Visited but Did Not Make Any Transactions | Easy | 33% | TopicsDatabase |
| 933. Number of Recent Calls | Easy | 33% | TopicsDesignQueueData Stream |
| 746. Min Cost Climbing Stairs | Easy | 33% | TopicsArrayDynamic Programming |
| Russian Doll Envelopes | Hard | 33% | TopicsArrayBinary SearchDynamic ProgrammingSortingLongest Increasing Subsequence |
| Customers Who Never Order | Easy | 31.8% | TopicsDatabase |
| The Skyline Problem | Hard | 31.8% | TopicsArrayDivide and ConquerBinary Indexed TreeSegment TreeSweep LineSortingHeap (Priority Queue)Ordered Set |
| Meeting Rooms | Easy | 31.8% | TopicsArraySortingQuicksort |
| The Maze | Medium | 31.8% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| 493. Reverse Pairs | Hard | 31.8% | TopicsArrayBinary SearchDivide and ConquerBinary Indexed TreeSegment TreeMerge SortOrdered SetTreap |
| Next Greater Element III | Medium | 31.8% | TopicsMathTwo PointersString |
| 713. Subarray Product Less Than K | Medium | 31.8% | TopicsArrayBinary SearchSliding WindowPrefix Sum |
| 912. Sort an Array | Medium | 31.8% | TopicsArrayDivide and ConquerSortingHeap (Priority Queue)Merge SortBucket SortRadix SortCounting Sort |
| 968. Binary Tree Cameras | Hard | 31.8% | TopicsDynamic ProgrammingTreeDepth-First SearchBinary TreeDP on Trees |
