Oracle
282 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1254. Number of Closed Islands | Medium | 34.7% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 920. Number of Music Playlists | Hard | 34.7% | TopicsMathDynamic ProgrammingCombinatorics |
| 1169. Invalid Transactions | Medium | 34.7% | TopicsArrayHash TableStringSorting |
| Distance to a Cycle in Undirected Graph | Hard | 34.7% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort |
| 129. Sum Root to Leaf Numbers | Medium | 34.7% | TopicsTreeDepth-First SearchBinary Tree |
| 787. Cheapest Flights Within K Stops | Medium | 34.7% | TopicsDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph TheoryHeap (Priority Queue)Shortest Path |
| 678. Valid Parenthesis String | Medium | 34.7% | TopicsStringDynamic ProgrammingStackGreedyBracket Sequences |
| 10. Regular Expression Matching | Hard | 26.6% | TopicsStringDynamic ProgrammingRecursion |
| 37. Sudoku Solver | Hard | 26.6% | TopicsArrayHash TableBacktrackingMatrixAlgorithm XDancing Links |
| 45. Jump Game II | Medium | 26.6% | TopicsArrayDynamic ProgrammingGreedy |
| 46. Permutations | Medium | 26.6% | TopicsArrayBacktracking |
| Pow(x, n) | Medium | 26.6% | TopicsMathRecursion |
| 57. Insert Interval | Medium | 26.6% | TopicsArray |
| Remove Duplicates from Sorted List | Easy | 26.6% | TopicsLinked List |
| 91. Decode Ways | Medium | 26.6% | TopicsStringDynamic Programming |
| 113. Path Sum II | Medium | 26.6% | TopicsBacktrackingTreeDepth-First SearchBinary Tree |
| Populating Next Right Pointers in Each Node | Medium | 26.6% | TopicsLinked ListTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 162. Find Peak Element | Medium | 26.6% | TopicsArrayBinary Search |
| Rotate Array | Medium | 26.6% | TopicsArrayMathTwo Pointers |
| Basic Calculator | Hard | 26.6% | TopicsMathStringStackRecursion |
| 226. Invert Binary Tree | Easy | 26.6% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 234. Palindrome Linked List | Easy | 26.6% | TopicsLinked ListTwo PointersStackRecursion |
| Integer to English Words | Hard | 26.6% | TopicsMathStringRecursion |
| Island Perimeter | Easy | 26.6% | TopicsArrayDepth-First SearchBreadth-First SearchMatrix |
| 19. Remove Nth Node From End of List | Medium | 26.6% | TopicsLinked ListTwo Pointers |
