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
2,344 questions at Google · all time
- Word BreakmediumArrayHash TableStringDynamic Programming+3frequency 44.6
- Diameter of Binary TreeeasyTreeDepth-First SearchBinary TreeDP on Treesfrequency 44.3
- Guess the WordhardArrayMathStringMinimax+2frequency 44.3
- Next Greater Element IeasyArrayHash TableStackMonotonic Stackfrequency 44.3
- Next Greater Element IImediumArrayStackMonotonic Stackfrequency 44.3
- String to Integer (atoi)mediumStringfrequency 44.3
- Find Customer RefereeeasyDatabasefrequency 44.0
- Random Pick with WeightmediumArrayMathBinary SearchPrefix Sum+1frequency 44.0
- Article Views IeasyDatabasefrequency 43.7
- Check if Array Is Sorted and RotatedeasyArrayfrequency 43.7
- Create a DataFrame from Listeasyfrequency 43.7
- Divide Two IntegersmediumMathBit Manipulationfrequency 43.7
- Maximum Average Subarray IeasyArraySliding Windowfrequency 43.7
- Squares of a Sorted ArrayeasyArrayTwo PointersSortingfrequency 43.7
- Word SearchmediumArrayStringBacktrackingDepth-First Search+1frequency 43.7
- Binary Tree Level Order TraversalmediumTreeBreadth-First SearchBinary Treefrequency 43.3
- Largest NumbermediumArrayStringGreedySortingfrequency 43.3
- Invert Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 43.0
- String CompressionmediumTwo PointersStringfrequency 43.0
- Wildcard MatchinghardStringDynamic ProgrammingGreedyRecursionfrequency 43.0
- Apply SubstitutionsmediumArrayHash TableStringDepth-First Search+3frequency 42.7
- First Unique Character in a StringeasyHash TableStringQueueCountingfrequency 42.7
- Minimum Size Subarray SummediumArrayBinary SearchSliding WindowPrefix Sumfrequency 42.7
- Move Pieces to Obtain a StringmediumTwo PointersStringfrequency 42.7
- Range ModulehardDesignSegment TreeOrdered Setfrequency 42.7
- Reverse PairshardArrayBinary SearchDivide and ConquerBinary Indexed Tree+4frequency 42.7
- Big CountrieseasyDatabasefrequency 42.4
- Number of ProvincesmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 42.4
- Remove Duplicates from Sorted ListeasyLinked Listfrequency 42.4
- Search a 2D MatrixmediumArrayBinary SearchMatrixfrequency 42.4
- Find the DifferenceeasyHash TableStringBit ManipulationSortingfrequency 42.0
- Lowest Common Ancestor of a Binary TreemediumTreeDepth-First SearchBinary TreeBinary Lifting+1frequency 42.0
- Minimum Area RectanglemediumArrayHash TableMathGeometry+1frequency 42.0
- Minimum Window SubstringhardHash TableStringSliding Windowfrequency 42.0
- Power of ThreeeasyMathRecursionfrequency 42.0
- Rising TemperatureeasyDatabasefrequency 42.0
- Search a 2D Matrix IImediumArrayBinary SearchDivide and ConquerMatrixfrequency 42.0
- Sort ListmediumLinked ListTwo PointersDivide and ConquerSorting+1frequency 42.0
- Word LadderhardHash TableStringBreadth-First SearchBidirectional Searchfrequency 42.0
- Burst BalloonshardArrayDynamic Programmingfrequency 41.7
- Majority Element IImediumArrayHash TableSortingCounting+1frequency 41.7
- Permutation in StringmediumHash TableTwo PointersStringSliding Windowfrequency 41.7
- Surrounded RegionsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 41.7
- Symmetric TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 41.7
- Unique Number of OccurrenceseasyArrayHash Tablefrequency 41.7
- Binary Tree Inorder TraversaleasyStackTreeDepth-First SearchBinary Treefrequency 41.3
- Kth Smallest Element in a BSTmediumTreeDepth-First SearchBinary Search TreeBinary Treefrequency 41.3
- Pacific Atlantic Water FlowmediumArrayDepth-First SearchBreadth-First SearchMatrixfrequency 41.3
- Remove Duplicates from Sorted Array IImediumArrayTwo Pointersfrequency 41.3
- Meeting Rooms IIIhardArrayHash TableSortingHeap (Priority Queue)+1frequency 41.0
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.