Problems
Callback's own problems and the LeetCode questions companies have been asking, in one place — filter by category, company, topic, difficulty, and how recently a question showed up.
Asked on LeetCode
1,223 questions at Bloomberg · all time
- Odd Even Linked ListmediumLinked Listfrequency 44.8
- Search a 2D Matrix IImediumArrayBinary SearchDivide and ConquerMatrixfrequency 44.8
- Search in Rotated Sorted Array IImediumArrayBinary Searchfrequency 44.8
- Top K Frequent WordsmediumArrayHash TableStringTrie+4frequency 44.8
- Basic CalculatorhardMathStringStackRecursionfrequency 43.7
- Course SchedulemediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort+1frequency 43.7
- Employees Earning More Than Their ManagerseasyDatabasefrequency 43.7
- Implement Queue using StackseasyStackDesignQueuefrequency 43.7
- Longest Valid ParentheseshardStringDynamic ProgrammingStackBracket Sequencesfrequency 43.7
- Monthly Transactions ImediumDatabasefrequency 43.7
- Power of TwoeasyMathBit ManipulationRecursionfrequency 43.7
- Rearrange Array Elements by SignmediumArrayTwo PointersSimulationfrequency 43.7
- Add DigitseasyMathSimulationNumber Theoryfrequency 42.6
- Binary Tree Right Side ViewmediumTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 42.6
- Count PrimesmediumArrayMathEnumerationNumber Theory+3frequency 42.6
- Factorial Trailing ZeroesmediumMathfrequency 42.6
- Find All Anagrams in a StringmediumHash TableStringSliding Windowfrequency 42.6
- First Missing PositivehardArrayHash Tablefrequency 42.6
- Kth Missing Positive NumbereasyArrayBinary Searchfrequency 42.6
- Largest NumbermediumArrayStringGreedySortingfrequency 42.6
- Minimum Absolute DifferenceeasyArraySortingfrequency 42.6
- Minimum Window SubstringhardHash TableStringSliding Windowfrequency 42.6
- Permutation in StringmediumHash TableTwo PointersStringSliding Windowfrequency 42.6
- Remove K DigitsmediumStringStackGreedyMonotonic Stackfrequency 42.6
- Reverse PairshardArrayBinary SearchDivide and ConquerBinary Indexed Tree+4frequency 42.6
- Serialize and Deserialize Binary TreehardStringTreeDepth-First SearchBreadth-First Search+2frequency 42.6
- Sort Characters By FrequencymediumHash TableStringSortingHeap (Priority Queue)+2frequency 42.6
- Sort ListmediumLinked ListTwo PointersDivide and ConquerSorting+1frequency 42.6
- Sort an ArraymediumArrayDivide and ConquerSortingHeap (Priority Queue)+4frequency 42.6
- Accounts MergemediumArrayHash TableStringDepth-First Search+3frequency 41.4
- Arranging CoinseasyMathBinary Searchfrequency 41.4
- Average Selling PriceeasyDatabasefrequency 41.4
- Binary Subarrays With SummediumArrayHash TableSliding WindowPrefix Sumfrequency 41.4
- Binary Tree Inorder TraversaleasyStackTreeDepth-First SearchBinary Treefrequency 41.4
- Course Schedule IImediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sortfrequency 41.4
- Fizz BuzzeasyMathStringSimulationfrequency 41.4
- House Robber IImediumArrayDynamic Programmingfrequency 41.4
- Majority Element IImediumArrayHash TableSortingCounting+1frequency 41.4
- Maximal RectanglehardArrayDynamic ProgrammingStackMatrix+1frequency 41.4
- Middle of the Linked ListeasyLinked ListTwo Pointersfrequency 41.4
- Remove Duplicates from Sorted Array IImediumArrayTwo Pointersfrequency 41.4
- Remove Linked List ElementseasyLinked ListRecursionfrequency 41.4
- Simplify PathmediumStringStackfrequency 41.4
- Surrounded RegionsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 41.4
- Diagonal TraversemediumArrayMatrixSimulationfrequency 40.1
- Find Median from Data StreamhardTwo PointersDesignSortingHeap (Priority Queue)+1frequency 40.1
- Flatten Binary Tree to Linked ListmediumLinked ListStackTreeDepth-First Search+1frequency 40.1
- Linked List Cycle IImediumHash TableLinked ListTwo PointersFloyd's Cycle Finding Algorithmfrequency 40.1
- Longest Common SubsequencemediumStringDynamic ProgrammingLongest Common Subsequencefrequency 40.1
- Next Greater Element IIImediumMathTwo PointersStringfrequency 40.1
Listings only — titles, difficulty, and tags link out to LeetCode. Imported from the leetcode-company-wise-problems snapshot dated 1 June 2025. Frequency is that dataset's own relative score within a company and time range.