Yahoo
30 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1. Two Sum | Easy | 100% | TopicsArrayHash Table |
| 104. Maximum Depth of Binary Tree | Easy | 100% | TopicsTreeDepth-First SearchBreadth-First SearchBinary Tree |
| 146. LRU Cache | Medium | 100% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 206. Reverse Linked List | Easy | 100% | TopicsLinked ListRecursion |
| 297. Serialize and Deserialize Binary Tree | Hard | 100% | TopicsStringTreeDepth-First SearchBreadth-First SearchDesignBinary Tree |
| Largest Palindrome Product | Hard | 100% | TopicsMathEnumeration |
| 4. Median of Two Sorted Arrays | Hard | 96.9% | TopicsArrayBinary SearchDivide and Conquer |
| 13. Roman to Integer | Easy | 96.9% | TopicsHash TableMathString |
| 139. Word Break | Medium | 96.9% | TopicsArrayHash TableStringDynamic ProgrammingTrieMemoizationBrute-Force Search |
| 141. Linked List Cycle | Easy | 96.9% | TopicsHash TableLinked ListTwo PointersFloyd's Cycle Finding Algorithm |
| 217. Contains Duplicate | Easy | 96.9% | TopicsArrayHash TableSorting |
| Peeking Iterator | Medium | 96.9% | TopicsArrayDesignIterator |
| 491. Non-decreasing Subsequences | Medium | 96.9% | TopicsArrayHash TableBacktrackingBit Manipulation |
| Maximum Distance in Arrays | Medium | 96.9% | TopicsArrayGreedy |
| Binary Number with Alternating Bits | Easy | 96.9% | TopicsBit Manipulation |
| 1030. Matrix Cells in Distance Order | Easy | 96.9% | TopicsArrayMathGeometrySortingMatrix |
| 347. Top K Frequent Elements | Medium | 84.6% | TopicsArrayHash TableDivide and ConquerSortingHeap (Priority Queue)Bucket SortCountingQuickselect |
| 39. Combination Sum | Medium | 71.2% | TopicsArrayBacktracking |
| 14. Longest Common Prefix | Easy | 60.6% | TopicsArrayStringTrie |
| 20. Valid Parentheses | Easy | 60.6% | TopicsStringStackBracket Sequences |
| 54. Spiral Matrix | Medium | 60.6% | TopicsArrayMatrixSimulation |
| 98. Validate Binary Search Tree | Medium | 60.6% | TopicsTreeDepth-First SearchBinary Search TreeBinary Tree |
| Decode String | Medium | 60.6% | TopicsStringStackRecursion |
| 560. Subarray Sum Equals K | Medium | 60.6% | TopicsArrayHash TablePrefix Sum |
| 93. Restore IP Addresses | Medium | 60.6% | TopicsStringBacktracking |
