Sigmoid
15 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 121. Best Time to Buy and Sell Stock | Easy | 100% | TopicsArrayDynamic Programming |
| 283. Move Zeroes | Easy | 100% | TopicsArrayTwo Pointers |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 87.3% | TopicsTreeBreadth-First SearchBinary Tree |
| 25. Reverse Nodes in k-Group | Hard | 87.3% | TopicsLinked ListRecursion |
| 881. Boats to Save People | Medium | 87.3% | TopicsArrayTwo PointersGreedySortingTimsort |
| 155. Min Stack | Medium | 87.3% | TopicsStackDesign |
| Best Time to Buy and Sell Stock II | Medium | 87.3% | TopicsArrayDynamic ProgrammingGreedy |
| 49. Group Anagrams | Medium | 87.3% | TopicsArrayHash TableStringSorting |
| 14. Longest Common Prefix | Easy | 87.3% | TopicsArrayStringTrie |
| 994. Rotting Oranges | Medium | 87.3% | TopicsArrayBreadth-First SearchMatrix |
| 200. Number of Islands | Medium | 87.3% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| Next Greater Element II | Medium | 87.3% | TopicsArrayStackMonotonic Stack |
| 56. Merge Intervals | Medium | 87.3% | TopicsArraySortingQuicksort |
| 42. Trapping Rain Water | Hard | 87.3% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
| 3. Longest Substring Without Repeating Characters | Medium | 87.3% | TopicsHash TableStringSliding Window |
