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
- Range Sum Query - ImmutableeasyArrayDesignPrefix Sumfrequency 35.6
- Replace Employee ID With The Unique IdentifiereasyDatabasefrequency 35.6
- Running Sum of 1d ArrayeasyArrayPrefix Sumfrequency 35.6
- Unique Number of OccurrenceseasyArrayHash Tablefrequency 35.6
- Valid Parenthesis StringmediumStringDynamic ProgrammingStackGreedy+1frequency 35.6
- Assign CookieseasyArrayTwo PointersGreedySorting+1frequency 33.8
- Best Time to Buy and Sell Stock with Transaction FeemediumArrayDynamic ProgrammingGreedyfrequency 33.8
- CombinationsmediumBacktrackingfrequency 33.8
- Continuous Subarray SummediumArrayHash TableMathPrefix Sum+1frequency 33.8
- Cousins in Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 33.8
- Even Odd TreemediumTreeBreadth-First SearchBinary Treefrequency 33.8
- Excel Sheet Column TitleeasyMathStringfrequency 33.8
- Exchange SeatsmediumDatabasefrequency 33.8
- Find Pivot IndexeasyArrayPrefix Sumfrequency 33.8
- Find in Mountain ArrayhardArrayBinary SearchInteractiveTernary Searchfrequency 33.8
- Find the DifferenceeasyHash TableStringBit ManipulationSortingfrequency 33.8
- Flood FilleasyArrayDepth-First SearchBreadth-First SearchMatrixfrequency 33.8
- Minimum Path SummediumArrayDynamic ProgrammingMatrixfrequency 33.8
- Nth Highest SalarymediumDatabasefrequency 33.8
- Partition Array Into Two Arrays to Minimize Sum DifferencehardArrayTwo PointersBinary SearchDynamic Programming+5frequency 33.8
- Power of ThreeeasyMathRecursionfrequency 33.8
- Set MismatcheasyArrayHash TableBit ManipulationSortingfrequency 33.8
- Shortest Path to Get FoodmediumArrayBreadth-First SearchMatrixfrequency 33.8
- Sparse Matrix MultiplicationmediumArrayHash TableMatrixLinear Algebrafrequency 33.8
- Trim a Binary Search TreemediumTreeDepth-First SearchBinary Search TreeBinary Treefrequency 33.8
- Boats to Save PeoplemediumArrayTwo PointersGreedySorting+1frequency 31.9
- Build Array from PermutationeasyArraySimulationfrequency 31.9
- Confirmation RatemediumDatabasefrequency 31.9
- Design Search Autocomplete SystemhardStringDepth-First SearchDesignTrie+3frequency 31.9
- Different Ways to Add ParenthesesmediumMathStringDynamic ProgrammingRecursion+2frequency 31.9
- Duplicate EmailseasyDatabasefrequency 31.9
- Find Eventual Safe StatesmediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort+2frequency 31.9
- HeatersmediumArrayTwo PointersBinary SearchSortingfrequency 31.9
- Insert IntervalmediumArrayfrequency 31.9
- Interleaving StringmediumStringDynamic Programmingfrequency 31.9
- Invert Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 31.9
- Jewels and StoneseasyHash TableStringfrequency 31.9
- Letter Tile PossibilitiesmediumHash TableStringBacktrackingCountingfrequency 31.9
- Maximum Product of Three NumberseasyArrayMathSortingfrequency 31.9
- Maximum Width of Binary TreemediumTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 31.9
- Minimum Add to Make Parentheses ValidmediumStringStackGreedyBracket Sequencesfrequency 31.9
- Minimum Depth of Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 31.9
- Palindromic SubstringsmediumTwo PointersStringDynamic Programmingfrequency 31.9
- Partition Array According to Given PivotmediumArrayTwo PointersSimulationfrequency 31.9
- Permutations IImediumArrayBacktrackingSortingfrequency 31.9
- Product Sales Analysis IIImediumDatabasefrequency 31.9
- Rank Transform of an ArrayeasyArrayHash TableSortingfrequency 31.9
- Remove All Adjacent Duplicates In StringeasyStringStackfrequency 31.9
- Remove Duplicate LettersmediumStringStackGreedyMonotonic Stackfrequency 31.9
- Repeated DNA SequencesmediumHash TableStringBit ManipulationSliding Window+4frequency 31.9
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.