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
3,110 questions · all time
- Find All Possible Stable Binary Arrays IIhardDynamic ProgrammingPrefix Sum1 company
- Happy StudentsmediumArraySortingEnumeration1 company
- Surface Area of 3D ShapeseasyArrayMathGeometryMatrix1 company
- Ugly Number IIImediumMathBinary SearchCombinatoricsNumber Theory+41 company
- XOR After Range Multiplication Queries IIhardArrayDivide and ConquerPrefix Sum1 company
- Apply Operations to Maximize Frequency ScorehardArrayBinary SearchSliding WindowSorting+11 company
- Bank Account Summary IIeasyDatabase1 company
- Bitwise XOR of All PairingsmediumArrayBit ManipulationBrainteaser1 company
- Build Array Where You Can Find The Maximum Exactly K ComparisonshardDynamic ProgrammingPrefix Sum1 company
- Card Flipping GamemediumArrayHash Table1 company
- Chalkboard XOR GamehardArrayMathBit ManipulationBrainteaser+31 company
- Construct Uniform Parity Array IeasyArrayMath1 company
- Count Distinct Integers After Removing ZerosmediumMathDynamic Programming1 company
- Count Elements With Strictly Smaller and Greater ElementseasyArraySortingCounting1 company
- Count Number of Homogenous SubstringsmediumMathString1 company
- Count Special IntegershardMathDynamic Programming1 company
- Count The Number of Winning SequenceshardStringDynamic Programming1 company
- Count The RepetitionshardTwo PointersStringDynamic Programming1 company
- Count Valid Sequencesmedium1 company
- Day of the WeekeasyMath1 company
- Design Auction SystemmediumHash TableDesignHeap (Priority Queue)Ordered Set1 company
- Determine if String Halves Are AlikeeasyStringCounting1 company
- Find Students Who ImprovedmediumDatabase1 company
- Find the Key of the NumberseasyMath1 company
- Find the Number of Winning PlayerseasyArrayHash TableCounting1 company
- Generate a String With Characters That Have Odd CountseasyString1 company
- Goal Parser InterpretationeasyString1 company
- Hash Divided StringmediumStringSimulation1 company
- Highest Grade For Each StudentmediumDatabase1 company
- K-th Largest Perfect Subtree Size in Binary TreemediumTreeDepth-First SearchSortingBinary Tree1 company
- Longest Special Path IIhardArrayHash TableTreeDepth-First Search+11 company
- Make the XOR of All Segments Equal to ZerohardArrayHash TableDynamic ProgrammingBit Manipulation+11 company
- Maximum Area Rectangle With Point Constraints IIhardArrayMathBinary Indexed TreeSegment Tree+21 company
- Maximum Number of Moves in a GridmediumArrayDynamic ProgrammingMatrix1 company
- Maximum Product of the Length of Two Palindromic SubsequencesmediumStringDynamic ProgrammingBacktrackingBit Manipulation+11 company
- Maximum Subarray Sum After at Most K Swapshard1 company
- Minimum Moves to Convert StringeasyStringGreedy1 company
- Minimum Number of Days to Disconnect IslandhardArrayDepth-First SearchBreadth-First SearchMatrix+21 company
- Minimum Operations to Transform Array into Alternating PrimemediumArrayMathTwo PointersBinary Search+21 company
- Modify Graph Edge WeightshardGraph TheoryHeap (Priority Queue)Shortest Path1 company
- Number of Senior CitizenseasyArrayString1 company
- Number of Ways to Reach a Position After Exactly k StepsmediumMathDynamic ProgrammingCombinatorics1 company
- Partition Array for Maximum XOR and ANDhardArrayMathGreedyBit Manipulation+11 company
- Projection Area of 3D ShapeseasyArrayMathGeometryMatrix1 company
- Reshape Data: Concatenateeasy1 company
- Reverse Degree of a StringeasyStringSimulation1 company
- Smallest Rotation with Highest ScorehardArrayPrefix Sum1 company
- Stone Game VIImediumArrayMathDynamic ProgrammingMinimax+21 company
- Swap For Longest Repeated Character SubstringmediumHash TableStringSliding Window1 company
- Unique Middle Elementeasy1 company
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.