Oracle
282 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1380. Lucky Numbers in a Matrix | Easy | 55.2% | TopicsArrayMatrix |
| 1410. HTML Entity Parser | Medium | 55.2% | TopicsHash TableString |
| 4. Median of Two Sorted Arrays | Hard | 52.4% | TopicsArrayBinary SearchDivide and Conquer |
| 42. Trapping Rain Water | Hard | 52.4% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
| 75. Sort Colors | Medium | 52.4% | TopicsArrayTwo PointersSortingQuicksortBubble Sort |
| 76. Minimum Window Substring | Hard | 52.4% | TopicsHash TableStringSliding Window |
| 93. Restore IP Addresses | Medium | 52.4% | TopicsStringBacktracking |
| 103. Binary Tree Zigzag Level Order Traversal | Medium | 52.4% | TopicsTreeBreadth-First SearchBinary Tree |
| 169. Majority Element | Easy | 52.4% | TopicsArrayHash TableDivide and ConquerSortingCountingBoyer–Moore Majority Vote Algorithm |
| Lowest Common Ancestor of a Binary Tree | Medium | 52.4% | TopicsTreeDepth-First SearchBinary TreeBinary LiftingLowest Common Ancestor |
| 322. Coin Change | Medium | 52.4% | TopicsArrayDynamic ProgrammingBreadth-First SearchKnapsack ProblemComplete Knapsack |
| Delete Node in a BST | Medium | 52.4% | TopicsTreeBinary Search TreeBinary Tree |
| 543. Diameter of Binary Tree | Easy | 52.4% | TopicsTreeDepth-First SearchBinary TreeDP on Trees |
| 621. Task Scheduler | Medium | 52.4% | TopicsArrayHash TableGreedySortingHeap (Priority Queue)Counting |
| 125. Valid Palindrome | Easy | 52.4% | TopicsTwo PointersString |
| Implement Trie (Prefix Tree) | Medium | 52.4% | TopicsHash TableStringDesignTrie |
| 127. Word Ladder | Hard | 52.4% | TopicsHash TableStringBreadth-First SearchBidirectional Search |
| 2954. Count the Number of Infection Sequences | Hard | 52.4% | TopicsArrayMathCombinatoricsFermat's Little Theorem |
| 14. Longest Common Prefix | Easy | 49.2% | TopicsArrayStringTrie |
| 34. Find First and Last Position of Element in Sorted Array | Medium | 49.2% | TopicsArrayBinary Search |
| 134. Gas Station | Medium | 49.2% | TopicsArrayGreedy |
| 210. Course Schedule II | Medium | 49.2% | TopicsDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort |
| 215. Kth Largest Element in an Array | Medium | 49.2% | TopicsArrayDivide and ConquerSortingHeap (Priority Queue)Quickselect |
| Maximal Square | Medium | 49.2% | TopicsArrayDynamic ProgrammingMatrix |
| 230. Kth Smallest Element in a BST | Medium | 49.2% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
