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
- Duplicate EmailseasyDatabasefrequency 26.3
- Expressive WordsmediumArrayTwo PointersStringfrequency 26.3
- Find Leaves of Binary TreemediumTreeDepth-First SearchBinary TreeDP on Treesfrequency 26.3
- Find the Length of the Longest Common PrefixmediumArrayHash TableStringTriefrequency 26.3
- First Letter to Appear TwiceeasyHash TableStringBit ManipulationCountingfrequency 26.3
- Frog JumphardArrayDynamic Programmingfrequency 26.3
- HeatersmediumArrayTwo PointersBinary SearchSortingfrequency 26.3
- Interval List IntersectionsmediumArrayTwo PointersSweep Linefrequency 26.3
- Invalid TweetseasyDatabasefrequency 26.3
- Longest Absolute File PathmediumStringStackDepth-First Searchfrequency 26.3
- Make The String GreateasyStringStackfrequency 26.3
- Max Points on a LinehardArrayHash TableMathGeometry+2frequency 26.3
- Maximum Number of Distinct Elements After OperationsmediumArrayGreedySortingfrequency 26.3
- Maximum Score of a Node SequencehardArrayGraph TheorySortingEnumerationfrequency 26.3
- Maximum Sum Circular SubarraymediumArrayDivide and ConquerDynamic ProgrammingQueue+1frequency 26.3
- Maximum Sum of 3 Non-Overlapping SubarrayshardArrayDynamic ProgrammingSliding WindowPrefix Sumfrequency 26.3
- Minimum Cost to Cut a StickhardArrayDynamic ProgrammingSortingfrequency 26.3
- Missing RangeseasyArrayfrequency 26.3
- My Calendar IImediumArrayBinary SearchDesignSegment Tree+2frequency 26.3
- Ones and ZeroesmediumArrayStringDynamic ProgrammingKnapsack Problem+1frequency 26.3
- Optimal Account BalancinghardArrayDynamic ProgrammingBacktrackingBit Manipulation+1frequency 26.3
- Power of FoureasyMathBit ManipulationRecursionfrequency 26.3
- Project Employees IeasyDatabasefrequency 26.3
- Queries Quality and PercentageeasyDatabasefrequency 26.3
- RLE IteratormediumArrayDesignCountingIteratorfrequency 26.3
- Reverse BitseasyDivide and ConquerBit Manipulationfrequency 26.3
- Robot Room CleanerhardBacktrackingInteractivefrequency 26.3
- Student Attendance Record IIhardDynamic Programmingfrequency 26.3
- Tuple with Same ProductmediumArrayHash TableCountingfrequency 26.3
- User Activity for the Past 30 Days IeasyDatabasefrequency 26.3
- Valid Word AbbreviationeasyTwo PointersStringfrequency 26.3
- Walls and GatesmediumArrayBreadth-First SearchMatrixfrequency 26.3
- Build an Array With Stack OperationsmediumArrayStackSimulationfrequency 25.4
- Bulls and CowsmediumHash TableStringCountingfrequency 25.4
- Convert Sorted List to Binary Search TreemediumLinked ListDivide and ConquerTreeBinary Search Tree+1frequency 25.4
- Count Number of Bad PairsmediumArrayHash TableMathCountingfrequency 25.4
- Counting BitseasyDynamic ProgrammingBit Manipulationfrequency 25.4
- Create Maximum NumberhardArrayTwo PointersStackGreedy+1frequency 25.4
- Defanging an IP AddresseasyStringfrequency 25.4
- Delete Operation for Two StringsmediumStringDynamic ProgrammingLongest Common Subsequencefrequency 25.4
- Design Circular QueuemediumArrayLinked ListDesignQueuefrequency 25.4
- Distinct SubsequenceshardStringDynamic Programmingfrequency 25.4
- Find All K-Distant Indices in an ArrayeasyArrayTwo Pointersfrequency 25.4
- Find Mode in Binary Search TreeeasyTreeDepth-First SearchBinary Search TreeBinary Treefrequency 25.4
- Find the Most Competitive SubsequencemediumArrayStackGreedyMonotonic Stackfrequency 25.4
- Find the Prefix Common Array of Two ArraysmediumArrayHash TableBit Manipulationfrequency 25.4
- Kth Smallest Element in a Sorted MatrixmediumArrayBinary SearchSortingHeap (Priority Queue)+1frequency 25.4
- Largest Number At Least Twice of OtherseasyArraySortingfrequency 25.4
- Longest Increasing Subsequence IIhardArrayDivide and ConquerDynamic ProgrammingBinary Indexed Tree+3frequency 25.4
- Longest Mountain in ArraymediumArrayTwo PointersDynamic ProgrammingEnumerationfrequency 25.4
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.