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
- Count Binary SubstringseasyTwo PointersStringfrequency 27.3
- Countereasyfrequency 27.3
- Decode WaysmediumStringDynamic Programmingfrequency 27.3
- Find K Closest ElementsmediumArrayTwo PointersBinary SearchSliding Window+2frequency 27.3
- Finding 3-Digit Even NumberseasyArrayHash TableRecursionSorting+1frequency 27.3
- Greatest Common Divisor of StringseasyMathStringEuclidean AlgorithmGreatest Common Divisorfrequency 27.3
- Insert Delete GetRandom O(1) - Duplicates allowedhardArrayHash TableMathDesign+1frequency 27.3
- Island PerimetereasyArrayDepth-First SearchBreadth-First SearchMatrixfrequency 27.3
- Kids With the Greatest Number of CandieseasyArrayfrequency 27.3
- Largest Odd Number in StringeasyMathStringGreedyfrequency 27.3
- Min Cost Climbing StairseasyArrayDynamic Programmingfrequency 27.3
- N-Queens IIhardBacktrackingAlgorithm Xfrequency 27.3
- Path SumeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 27.3
- Perfect NumbereasyMathfrequency 27.3
- Recover Binary Search TreemediumTreeDepth-First SearchBinary Search TreeBinary Treefrequency 27.3
- Remove All Occurrences of a SubstringmediumStringStackSimulationfrequency 27.3
- Single Number IIImediumArrayBit Manipulationfrequency 27.3
- Sort Array By ParityeasyArrayTwo PointersSortingfrequency 27.3
- The Number of Employees Which Report to Each EmployeeeasyDatabasefrequency 27.3
- Time Based Key-Value StoremediumHash TableStringBinary SearchDesignfrequency 27.3
- Transpose MatrixeasyArrayMatrixSimulationfrequency 27.3
- Valid Perfect SquareeasyMathBinary Searchfrequency 27.3
- Word Ladder IIhardHash TableStringBacktrackingBreadth-First Search+1frequency 27.3
- Word PatterneasyHash TableStringfrequency 27.3
- All Nodes Distance K in Binary TreemediumHash TableTreeDepth-First SearchBreadth-First Search+1frequency 24.6
- Angle Between Hands of a ClockmediumMathfrequency 24.6
- Array Prototype Lasteasyfrequency 24.6
- Baseball GameeasyArrayStackSimulationfrequency 24.6
- Best Sightseeing PairmediumArrayDynamic Programmingfrequency 24.6
- Binary Tree Postorder TraversaleasyStackTreeDepth-First SearchBinary Treefrequency 24.6
- Bus RouteshardArrayHash TableBreadth-First Searchfrequency 24.6
- Check If N and Its Double ExisteasyArrayHash TableTwo PointersBinary Search+1frequency 24.6
- Check if All Characters Have Equal Number of OccurrenceseasyHash TableStringCountingfrequency 24.6
- Coin Change IImediumArrayDynamic ProgrammingKnapsack ProblemComplete Knapsackfrequency 24.6
- Count Number of Nice SubarraysmediumArrayHash TableMathSliding Window+1frequency 24.6
- Count Symmetric IntegerseasyMathEnumerationfrequency 24.6
- Critical Connections in a NetworkhardDepth-First SearchGraph TheoryBiconnected ComponentBridge (Graph)frequency 24.6
- Defanging an IP AddresseasyStringfrequency 24.6
- Defuse the BombeasyArraySliding Windowfrequency 24.6
- Department Top Three SalarieshardDatabasefrequency 24.6
- Detect CapitaleasyStringfrequency 24.6
- Distinct SubsequenceshardStringDynamic Programmingfrequency 24.6
- Find Largest Value in Each Tree RowmediumTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 24.6
- Find Winner on a Tic Tac Toe GameeasyArrayHash TableMatrixSimulationfrequency 24.6
- Find a Peak Element IImediumArrayBinary SearchMatrixfrequency 24.6
- Find the Smallest Divisor Given a ThresholdmediumArrayBinary Searchfrequency 24.6
- Furthest Point From OrigineasyStringCountingfrequency 24.6
- Game Play Analysis IVmediumDatabasefrequency 24.6
- Guess Number Higher or LowereasyBinary SearchInteractivefrequency 24.6
- House Robber IVmediumArrayBinary SearchDynamic ProgrammingGreedyfrequency 24.6
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.