Bloomberg
1239 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 1. Two Sum | Easy | 100% | TopicsArrayHash Table |
| 56. Merge Intervals | Medium | 87.9% | TopicsArraySortingQuicksort |
| 2. Add Two Numbers | Medium | 85.2% | TopicsLinked ListMathRecursion |
| 3. Longest Substring Without Repeating Characters | Medium | 84.8% | TopicsHash TableStringSliding Window |
| 200. Number of Islands | Medium | 83.9% | TopicsArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix |
| 121. Best Time to Buy and Sell Stock | Easy | 83.8% | TopicsArrayDynamic Programming |
| Insert Delete GetRandom O(1) | Medium | 83.5% | TopicsArrayHash TableMathDesignRandomized |
| 20. Valid Parentheses | Easy | 83.1% | TopicsStringStackBracket Sequences |
| 42. Trapping Rain Water | Hard | 80.2% | TopicsArrayTwo PointersDynamic ProgrammingStackMonotonic Stack |
| 3Sum | Medium | 79.5% | TopicsArrayTwo PointersSorting |
| 5. Longest Palindromic Substring | Medium | 79.4% | TopicsTwo PointersStringDynamic ProgrammingManacher |
| 4. Median of Two Sorted Arrays | Hard | 79% | TopicsArrayBinary SearchDivide and Conquer |
| 14. Longest Common Prefix | Easy | 78.5% | TopicsArrayStringTrie |
| 1169. Invalid Transactions | Medium | 78.1% | TopicsArrayHash TableStringSorting |
| 79. Word Search | Medium | 77.4% | TopicsArrayStringBacktrackingDepth-First SearchMatrix |
| Flatten a Multilevel Doubly Linked List | Medium | 77.2% | TopicsLinked ListDepth-First SearchDoubly-Linked List |
| 11. Container With Most Water | Medium | 76.2% | TopicsArrayTwo PointersGreedy |
| Decode String | Medium | 75.8% | TopicsStringStackRecursion |
| 169. Majority Element | Easy | 75% | TopicsArrayHash TableDivide and ConquerSortingCountingBoyer–Moore Majority Vote Algorithm |
| 7. Reverse Integer | Medium | 74.3% | TopicsMath |
| 242. Valid Anagram | Easy | 73.9% | TopicsHash TableStringSorting |
| Remove Duplicates from Sorted Array | Easy | 73.2% | TopicsArrayTwo Pointers |
| 88. Merge Sorted Array | Easy | 72.9% | TopicsArrayTwo PointersSorting |
| 21. Merge Two Sorted Lists | Easy | 72.7% | TopicsLinked ListRecursion |
| 9. Palindrome Number | Easy | 72.4% | TopicsMath |
