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
116 questions at DE Shaw · all time
- Coin Change IImediumArrayDynamic ProgrammingKnapsack ProblemComplete Knapsackfrequency 45.8
- Consecutive Numbers SumhardMathEnumerationfrequency 45.8
- Count Vowel Substrings of a StringeasyHash TableStringfrequency 45.8
- Find Triangular Sum of an ArraymediumArrayMathSimulationCombinatorics+1frequency 45.8
- Find the Smallest Divisor Given a ThresholdmediumArrayBinary Searchfrequency 45.8
- HeatersmediumArrayTwo PointersBinary SearchSortingfrequency 45.8
- K-th Smallest in Lexicographical OrderhardTriefrequency 45.8
- Longest Consecutive SequencemediumArrayHash TableUnion-Findfrequency 45.8
- Longest String ChainmediumArrayHash TableTwo PointersString+2frequency 45.8
- Maximize Score of Numbers in RangesmediumArrayBinary SearchGreedySortingfrequency 45.8
- Minimum Cost to Merge StoneshardArrayDynamic ProgrammingPrefix Sumfrequency 45.8
- Minimum Number of Visited Cells in a GridhardArrayDynamic ProgrammingStackBreadth-First Search+4frequency 45.8
- Number of IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 45.8
- Put Marbles in BagshardArrayGreedySortingHeap (Priority Queue)frequency 45.8
- Rotting OrangesmediumArrayBreadth-First SearchMatrixfrequency 45.8
- Search a 2D MatrixmediumArrayBinary SearchMatrixfrequency 45.8
- Shortest Subarray to be Removed to Make Array SortedmediumArrayTwo PointersBinary SearchStack+1frequency 45.8
- Sum of Subarray RangesmediumArrayStackMonotonic Stackfrequency 45.8
- Text JustificationhardArrayStringSimulationfrequency 45.8
- 4SummediumArrayTwo PointersSortingfrequency 37.0
- All Nodes Distance K in Binary TreemediumHash TableTreeDepth-First SearchBreadth-First Search+1frequency 37.0
- Basic Calculator IImediumMathStringStackfrequency 37.0
- Best Time to Buy and Sell StockeasyArrayDynamic Programmingfrequency 37.0
- Best Time to Buy and Sell Stock IImediumArrayDynamic ProgrammingGreedyfrequency 37.0
- Boats to Save PeoplemediumArrayTwo PointersGreedySorting+1frequency 37.0
- Coin ChangemediumArrayDynamic ProgrammingBreadth-First SearchKnapsack Problem+1frequency 37.0
- Container With Most WatermediumArrayTwo PointersGreedyfrequency 37.0
- Create Maximum NumberhardArrayTwo PointersStackGreedy+1frequency 37.0
- Decode WaysmediumStringDynamic Programmingfrequency 37.0
- Design A LeaderboardmediumHash TableDesignSortingfrequency 37.0
- Diameter of Binary TreeeasyTreeDepth-First SearchBinary TreeDP on Treesfrequency 37.0
- Excel Sheet Column TitleeasyMathStringfrequency 37.0
- Find First and Last Position of Element in Sorted ArraymediumArrayBinary Searchfrequency 37.0
- Find K Closest ElementsmediumArrayTwo PointersBinary SearchSliding Window+2frequency 37.0
- Find Maximum Removals From Source StringmediumArrayHash TableTwo PointersString+1frequency 37.0
- Find Median from Data StreamhardTwo PointersDesignSortingHeap (Priority Queue)+1frequency 37.0
- Find the Shortest SuperstringhardArrayStringDynamic ProgrammingBit Manipulation+2frequency 37.0
- Flatten Nested List IteratormediumStackTreeDepth-First SearchDesign+2frequency 37.0
- House RobbermediumArrayDynamic Programmingfrequency 37.0
- House Robber IImediumArrayDynamic Programmingfrequency 37.0
- Koko Eating BananasmediumArrayBinary Searchfrequency 37.0
- Kth Largest Element in an ArraymediumArrayDivide and ConquerSortingHeap (Priority Queue)+1frequency 37.0
- Longest Valid ParentheseshardStringDynamic ProgrammingStackBracket Sequencesfrequency 37.0
- Loud and RichmediumArrayDepth-First SearchGraph TheoryTopological Sort+1frequency 37.0
- Max Consecutive Ones IIImediumArrayBinary SearchSliding WindowPrefix Sumfrequency 37.0
- Maximal RectanglehardArrayDynamic ProgrammingStackMatrix+1frequency 37.0
- Maximal SquaremediumArrayDynamic ProgrammingMatrixfrequency 37.0
- Maximum Number of Removable CharactersmediumArrayTwo PointersStringBinary Searchfrequency 37.0
- Maximum Width RampmediumArrayTwo PointersStackMonotonic Stackfrequency 37.0
- Meeting Rooms IImediumArrayTwo PointersGreedySorting+2frequency 37.0
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.