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
- Count Nice Pairs in an ArraymediumArrayHash TableMathCounting4 companies
- Loud and RichmediumArrayDepth-First SearchGraph TheoryTopological Sort+14 companies
- Process String with Special Operations ImediumStringSimulation4 companies
- Count Good Nodes in Binary TreemediumTreeDepth-First SearchBreadth-First SearchBinary Tree4 companies
- Count Odd Numbers in an Interval RangeeasyMath4 companies
- Longest Arithmetic SubsequencemediumArrayHash TableBinary SearchDynamic Programming4 companies
- Circular Array LoopmediumArrayHash TableTwo PointersFloyd's Cycle Finding Algorithm4 companies
- Minimum Initial Energy to Finish TaskshardArrayGreedySorting4 companies
- Find Center of Star GrapheasyGraph Theory4 companies
- Longest Nice SubstringeasyHash TableStringDivide and ConquerBit Manipulation+14 companies
- Lowest Common Ancestor of Deepest LeavesmediumHash TableTreeDepth-First SearchBreadth-First Search+44 companies
- Score of a StringeasyString4 companies
- Find Critical and Pseudo-Critical Edges in Minimum Spanning TreehardUnion-FindGraph TheorySortingMinimum Spanning Tree+44 companies
- Design a Food Rating SystemmediumArrayHash TableStringDesign+24 companies
- Minimum Increment to Make Array UniquemediumArrayGreedySortingCounting4 companies
- Next Greater Node In Linked ListmediumArrayLinked ListStackMonotonic Stack4 companies
- Number of Closed IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+14 companies
- Type of TriangleeasyArrayMathSortingPolygons4 companies
- Customers Who Bought All ProductsmediumDatabase4 companies
- Different Ways to Add ParenthesesmediumMathStringDynamic ProgrammingRecursion+24 companies
- Gray CodemediumMathBacktrackingBit Manipulation4 companies
- Reorder Data in Log FilesmediumArrayStringSorting4 companies
- Implement Rand10() Using Rand7()mediumMathRejection SamplingRandomizedProbability and Statistics4 companies
- Letter Tile PossibilitiesmediumHash TableStringBacktrackingCounting4 companies
- Design Circular DequemediumArrayLinked ListDesignQueue4 companies
- Find Missing ObservationsmediumArrayMathSimulation4 companies
- Max Pair Sum in an ArrayeasyArrayHash Table4 companies
- Partition Array Into Three Parts With Equal SumeasyArrayGreedy4 companies
- Smallest Missing Integer Greater Than Sequential Prefix SumeasyArrayHash TableSorting4 companies
- Find Original Array From Doubled ArraymediumArrayHash TableGreedySorting4 companies
- Stone Game IIIhardArrayMathDynamic ProgrammingMinimax+24 companies
- Complement of Base 10 IntegereasyBit Manipulation4 companies
- Elimination GamemediumMathRecursion4 companies
- Read N Characters Given read4 II - Call Multiple TimeshardArraySimulationInteractive4 companies
- Shortest Distance to Target String in a Circular ArrayeasyArrayString4 companies
- Shortest Path Visiting All NodeshardDynamic ProgrammingBit ManipulationBreadth-First SearchGraph Theory+14 companies
- Add to Array-Form of IntegereasyArrayMath4 companies
- Paths in Matrix Whose Sum Is Divisible by KhardArrayDynamic ProgrammingMatrix4 companies
- Kth Largest Sum in a Binary TreemediumTreeBreadth-First SearchSortingBinary Tree4 companies
- Row With Maximum OneseasyArrayMatrix4 companies
- Sum of GCD of Formed PairsmediumArrayMathTwo PointersSorting+24 companies
- Duplicate ZeroseasyArrayTwo Pointers4 companies
- Maximum Frequency of an Element After Performing Operations ImediumArrayBinary SearchSliding WindowSorting+14 companies
- Detect CapitaleasyString4 companies
- Maximum Level Sum of a Binary TreemediumTreeDepth-First SearchBreadth-First SearchBinary Tree4 companies
- Minimum Domino Rotations For Equal RowmediumArrayGreedy4 companies
- Wiggle Sort IImediumArrayDivide and ConquerGreedySorting+14 companies
- Combination Sum IIImediumArrayBacktracking4 companies
- Department Highest SalarymediumDatabase4 companies
- Minimum Jumps to Reach End via Prime TeleportationmediumArrayHash TableMathBreadth-First Search+14 companies
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.