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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Design Tic-Tac-Toe | Medium | 48.4% | TopicsArrayHash TableDesignMatrixSimulation |
| 424. Longest Repeating Character Replacement | Medium | 48.4% | TopicsHash TableStringSliding Window |
| Maximum Average Subarray I | Easy | 48.4% | TopicsArraySliding Window |
| 10. Regular Expression Matching | Hard | 47.9% | TopicsStringDynamic ProgrammingRecursion |
| Minimum Size Subarray Sum | Medium | 47.9% | TopicsArrayBinary SearchSliding WindowPrefix Sum |
| Construct Binary Tree from String | Medium | 47.9% | TopicsStringStackTreeDepth-First SearchBinary Tree |
| 131. Palindrome Partitioning | Medium | 47.4% | TopicsStringDynamic ProgrammingBacktracking |
| 349. Intersection of Two Arrays | Easy | 47.4% | TopicsArrayHash TableTwo PointersBinary SearchSorting |
| 525. Contiguous Array | Medium | 47.4% | TopicsArrayHash TablePrefix Sum |
| 39. Combination Sum | Medium | 46.8% | TopicsArrayBacktracking |
| 98. Validate Binary Search Tree | Medium | 46.8% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| 297. Serialize and Deserialize Binary Tree | Hard | 46.8% | TopicsStringTreeDepth-First SearchBreadth-First SearchDesignBinary Tree |
| 329. Longest Increasing Path in a Matrix | Hard | 46.8% | TopicsArrayDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph TheoryTopological SortMemoizationMatrixDirected Acyclic Graph |
| 695. Max Area of Island | Medium | 46.8% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 852. Peak Index in a Mountain Array | Medium | 46.8% | TopicsArrayBinary SearchTernary Search |
| 231. Power of Two | Easy | 46.3% | TopicsMathBit ManipulationRecursion |
| Product of Two Run-Length Encoded Arrays | Medium | 46.3% | TopicsArrayTwo Pointers |
| 84. Largest Rectangle in Histogram | Hard | 45.7% | TopicsArrayStackMonotonic StackRange Minimum/Maximum Query |
| 155. Min Stack | Medium | 45.7% | TopicsStackDesign |
| 202. Happy Number | Easy | 45.7% | TopicsHash TableMathTwo PointersFloyd's Cycle Finding Algorithm |
| Range Sum Query - Immutable | Easy | 45.7% | TopicsArrayDesignPrefix Sum |
| Split Array Largest Sum | Hard | 45.7% | TopicsArrayBinary SearchDynamic ProgrammingGreedyPrefix Sum |
| Battleships in a Board | Medium | 45.7% | TopicsArrayDepth-First SearchMatrix |
| Minesweeper | Medium | 45.7% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| 704. Binary Search | Easy | 45.7% | TopicsArrayBinary Search |
