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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Count and Say | Medium | 40.5% | TopicsString |
| First Missing Positive | Hard | 40.5% | TopicsArrayHash Table |
| Search in Rotated Sorted Array II | Medium | 40.5% | TopicsArrayBinary Search |
| 94. Binary Tree Inorder Traversal | Easy | 40.5% | TopicsStackTreeDepth-First SearchBinary Tree |
| Populating Next Right Pointers in Each Node II | Medium | 40.5% | TopicsLinked ListTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 152. Maximum Product Subarray | Medium | 40.5% | TopicsArrayDynamic Programming |
| Odd Even Linked List | Medium | 40.5% | TopicsLinked List |
| Next Greater Element II | Medium | 40.5% | TopicsArrayStackMonotonic Stack |
| 778. Swim in Rising Water | Hard | 40.5% | TopicsArrayBinary SearchDepth-First SearchBreadth-First SearchUnion-FindMinimaxHeap (Priority Queue)MatrixDijkstra's Algorithm |
| 2043. Simple Bank System | Medium | 40.5% | TopicsArrayHash TableDesignSimulation |
| 40. Combination Sum II | Medium | 39.7% | TopicsArrayBacktracking |
| Text Justification | Hard | 39.7% | TopicsArrayStringSimulation |
| Word Ladder II | Hard | 39.7% | TopicsHash TableStringBacktrackingBreadth-First SearchBidirectional Search |
| Combine Two Tables | Easy | 39.7% | TopicsDatabase |
| Second Highest Salary | Medium | 39.7% | TopicsDatabase |
| 300. Longest Increasing Subsequence | Medium | 39.7% | TopicsArrayBinary SearchDynamic ProgrammingLongest Increasing Subsequence |
| 567. Permutation in String | Medium | 39.7% | TopicsHash TableTwo PointersStringSliding Window |
| 100. Same Tree | Easy | 38.9% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 148. Sort List | Medium | 38.9% | TopicsLinked ListTwo PointersDivide and ConquerSortingMerge Sort |
| Search a 2D Matrix II | Medium | 38.9% | TopicsArrayBinary SearchDivide and ConquerMatrix |
| 287. Find the Duplicate Number | Medium | 38.9% | TopicsArrayTwo PointersBinary SearchBit ManipulationPigeonhole PrincipleFloyd's Cycle Finding Algorithm |
| 344. Reverse String | Easy | 38.9% | TopicsTwo PointersString |
| 621. Task Scheduler | Medium | 38.9% | TopicsArrayHash TableGreedySortingHeap (Priority Queue)Counting |
| 678. Valid Parenthesis String | Medium | 38.9% | TopicsStringDynamic ProgrammingStackGreedyBracket Sequences |
| 865. Smallest Subtree with all the Deepest Nodes | Medium | 38.9% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchBinary TreeBinary LiftingLowest Common AncestorDP on Trees |
