Oracle
282 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 146. LRU Cache | Medium | 100% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 1. Two Sum | Easy | 85.3% | TopicsArrayHash Table |
| 3. Longest Substring Without Repeating Characters | Medium | 84.6% | TopicsHash TableStringSliding Window |
| 200. Number of Islands | Medium | 83.3% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 49. Group Anagrams | Medium | 81% | TopicsArrayHash TableStringSorting |
| 347. Top K Frequent Elements | Medium | 77.6% | TopicsArrayHash TableDivide and ConquerSortingHeap (Priority Queue)Bucket SortCountingQuickselect |
| Sliding Window Maximum | Hard | 76.7% | TopicsArrayQueueSliding WindowHeap (Priority Queue)Monotonic QueueRange Minimum/Maximum Query |
| 23. Merge k Sorted Lists | Hard | 75.7% | TopicsLinked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort |
| 20. Valid Parentheses | Easy | 73.6% | TopicsStringStackBracket Sequences |
| Meeting Rooms II | Medium | 71.2% | TopicsArrayTwo PointersGreedySortingHeap (Priority Queue)Prefix Sum |
| 33. Search in Rotated Sorted Array | Medium | 69.9% | TopicsArrayBinary Search |
| LFU Cache | Hard | 69.9% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 56. Merge Intervals | Medium | 68.5% | TopicsArraySortingQuicksort |
| 206. Reverse Linked List | Easy | 65.5% | TopicsLinked ListRecursion |
| 1209. Remove All Adjacent Duplicates in String II | Medium | 65.5% | TopicsStringStack |
| 5. Longest Palindromic Substring | Medium | 63.8% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 11. Container With Most Water | Medium | 63.8% | TopicsArrayTwo PointersGreedy |
| 3Sum | Medium | 63.8% | TopicsArrayTwo PointersSorting |
| 54. Spiral Matrix | Medium | 63.8% | TopicsArrayMatrixSimulation |
| Decode String | Medium | 63.8% | TopicsStringStackRecursion |
| Asteroid Collision | Medium | 63.8% | TopicsArrayStackSimulation |
| 53. Maximum Subarray | Medium | 62% | TopicsArrayDivide and ConquerDynamic Programming |
| 3438. Find Valid Pair of Adjacent Digits in String | Easy | 62% | TopicsHash TableStringCounting |
| 875. Koko Eating Bananas | Medium | 62% | TopicsArrayBinary Search |
| 155. Min Stack | Medium | 59.9% | TopicsStackDesign |
