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1396 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 987. Vertical Order Traversal of a Binary Tree | Hard | 68.2% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchSortingBinary Tree |
| 5. Longest Palindromic Substring | Medium | 68% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| Valid Number | Hard | 68% | TopicsString |
| Diagonal Traverse | Medium | 67.4% | TopicsArrayMatrixSimulation |
| Exclusive Time of Functions | Medium | 67.2% | TopicsArrayStack |
| 863. All Nodes Distance K in Binary Tree | Medium | 66.7% | TopicsHash TableTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 207. Course Schedule | Medium | 66.5% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological SortDirected Acyclic Graph |
| 9. Palindrome Number | Easy | 65.6% | TopicsMath |
| 19. Remove Nth Node From End of List | Medium | 65.2% | TopicsLinked ListTwo Pointers |
| 200. Number of Islands | Medium | 65% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 11. Container With Most Water | Medium | 64.6% | TopicsArrayTwo PointersGreedy |
| Add Strings | Easy | 64.6% | TopicsMathStringSimulation |
| 42. Trapping Rain Water | Hard | 64.2% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
| 647. Palindromic Substrings | Medium | 64.2% | TopicsTwo PointersStringDynamic Programming |
| 78. Subsets | Medium | 63.8% | TopicsArrayBacktrackingBit Manipulation |
| Insert into a Sorted Circular Linked List | Medium | 63.8% | TopicsLinked List |
| Robot Room Cleaner | Hard | 63.6% | TopicsBacktrackingInteractive |
| 13. Roman to Integer | Easy | 63% | TopicsHash TableMathString |
| Convert Binary Search Tree to Sorted Doubly Linked List | Medium | 63% | TopicsLinked ListStackTreeDepth-First SearchBinary Search TreeBinary TreeDoubly-Linked List |
| 53. Maximum Subarray | Medium | 62.6% | TopicsArrayDivide and ConquerDynamic Programming |
| 283. Move Zeroes | Easy | 62.6% | TopicsArrayTwo Pointers |
| Closest Binary Search Tree Value | Easy | 62.3% | TopicsBinary SearchTreeDepth-First SearchBinary Search TreeBinary Tree |
| Accounts Merge | Medium | 61.9% | TopicsArrayHash TableStringDepth-First SearchBreadth-First SearchUnion-FindSorting |
| Binary Search Tree Iterator | Medium | 61.4% | TopicsStackTreeDesignBinary Search TreeBinary TreeIterator |
| Group Shifted Strings | Medium | 61.4% | TopicsArrayHash TableString |
