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11 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| Next Permutation | Medium | 100% | TopicsArrayTwo Pointers |
| Coin Change II | Medium | 86.5% | TopicsArrayDynamic ProgrammingKnapsack ProblemComplete Knapsack |
| 54. Spiral Matrix | Medium | 86.5% | TopicsArrayMatrixSimulation |
| Count Salary Categories | Medium | 86.5% | TopicsDatabase |
| 678. Valid Parenthesis String | Medium | 86.5% | TopicsStringDynamic ProgrammingStackGreedyBracket Sequences |
| 9. Palindrome Number | Easy | 86.5% | TopicsMath |
| 11. Container With Most Water | Medium | 86.5% | TopicsArrayTwo PointersGreedy |
| 5. Longest Palindromic Substring | Medium | 86.5% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 130. Surrounded Regions | Medium | 86.5% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 78. Subsets | Medium | 86.5% | TopicsArrayBacktrackingBit Manipulation |
| 42. Trapping Rain Water | Hard | 86.5% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
