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
64 questions at eBay · all time
- LRU CachemediumHash TableLinked ListDesignDoubly-Linked Listfrequency 100.0
- Remove One Element to Make the Array Strictly IncreasingeasyArrayfrequency 97.7
- Alternating Digit SumeasyMathfrequency 92.4
- Binary GapeasyBit Manipulationfrequency 89.3
- Design SkiplisthardLinked ListDesignfrequency 89.3
- Minimize Maximum Pair Sum in ArraymediumArrayTwo PointersGreedySortingfrequency 89.3
- Minimum Window SubsequencehardStringDynamic ProgrammingSliding Windowfrequency 89.3
- Partition Equal Subset SummediumArrayDynamic ProgrammingKnapsack Problem0-1 Knapsackfrequency 89.3
- Spiral MatrixmediumArrayMatrixSimulationfrequency 89.3
- Subtree of Another TreeeasyTreeDepth-First SearchString MatchingBinary Tree+1frequency 89.3
- Two SumeasyArrayHash Tablefrequency 85.8
- Number of IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 81.7
- Binary Tree CamerashardDynamic ProgrammingTreeDepth-First SearchBinary Tree+1frequency 76.9
- Merge IntervalsmediumArraySortingQuicksortfrequency 76.9
- Open the LockmediumArrayHash TableStringBreadth-First Search+1frequency 76.9
- Pow(x, n)mediumMathRecursionfrequency 76.9
- Reverse PairshardArrayBinary SearchDivide and ConquerBinary Indexed Tree+4frequency 76.9
- Set Matrix ZeroesmediumArrayHash TableMatrixfrequency 76.9
- Top K Frequent ElementsmediumArrayHash TableDivide and ConquerSorting+4frequency 76.9
- Course SchedulemediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sort+1frequency 71.0
- Group AnagramsmediumArrayHash TableStringSortingfrequency 71.0
- Longest Palindromic SubstringmediumTwo PointersStringDynamic ProgrammingManacherfrequency 71.0
- Matchsticks to SquaremediumArrayDynamic ProgrammingBacktrackingBit Manipulation+1frequency 71.0
- Maximal SquaremediumArrayDynamic ProgrammingMatrixfrequency 71.0
- Minimize Result by Adding Parentheses to ExpressionmediumStringEnumerationfrequency 71.0
- Sort Array By ParityeasyArrayTwo PointersSortingfrequency 71.0
- Time Based Key-Value StoremediumHash TableStringBinary SearchDesignfrequency 71.0
- Valid ParentheseseasyStringStackBracket Sequencesfrequency 71.0
- Word LadderhardHash TableStringBreadth-First SearchBidirectional Searchfrequency 71.0
- 3SummediumArrayTwo PointersSortingfrequency 63.5
- Block Placement QuerieshardArrayBinary SearchBinary Indexed TreeSegment Tree+1frequency 63.5
- Decode StringmediumStringStackRecursionfrequency 63.5
- Interleaving StringmediumStringDynamic Programmingfrequency 63.5
- Jump Game IImediumArrayDynamic ProgrammingGreedyfrequency 63.5
- Longest Substring Without Repeating CharactersmediumHash TableStringSliding Windowfrequency 63.5
- Reconstruct ItineraryhardArrayStringDepth-First SearchGraph Theory+5frequency 63.5
- Restore the Array From Adjacent PairsmediumArrayHash TableDepth-First Searchfrequency 63.5
- Rotting OrangesmediumArrayBreadth-First SearchMatrixfrequency 63.5
- Shortest Unsorted Continuous SubarraymediumArrayTwo PointersStackGreedy+2frequency 63.5
- Sort ColorsmediumArrayTwo PointersSortingQuicksort+1frequency 63.5
- Valid Palindrome IIeasyTwo PointersStringGreedyfrequency 63.5
- Word SearchmediumArrayStringBacktrackingDepth-First Search+1frequency 63.5
- Alien DictionaryhardArrayStringDepth-First SearchBreadth-First Search+3frequency 52.9
- Alternating Groups IImediumArraySliding Windowfrequency 52.9
- Best Time to Buy and Sell Stock IImediumArrayDynamic ProgrammingGreedyfrequency 52.9
- Clone GraphmediumHash TableDepth-First SearchBreadth-First SearchGraph Theoryfrequency 52.9
- Design a Stack With Increment OperationmediumArrayStackDesignfrequency 52.9
- Find Median from Data StreamhardTwo PointersDesignSortingHeap (Priority Queue)+1frequency 52.9
- Find Peak ElementmediumArrayBinary Searchfrequency 52.9
- Generate ParenthesesmediumStringDynamic ProgrammingBacktrackingBracket Sequencesfrequency 52.9
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.