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
- Number of ProvincesmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theory9 companies
- Maximum Sum Circular SubarraymediumArrayDivide and ConquerDynamic ProgrammingQueue+19 companies
- Lowest Common Ancestor of a Binary Tree IIImediumHash TableTwo PointersTreeBinary Tree+29 companies
- Majority ElementeasyArrayHash TableDivide and ConquerSorting+29 companies
- Block Placement QuerieshardArrayBinary SearchBinary Indexed TreeSegment Tree+19 companies
- Binary Tree Right Side ViewmediumTreeDepth-First SearchBreadth-First SearchBinary Tree9 companies
- Design In-Memory File SystemhardHash TableStringDesignTrie+19 companies
- Reverse StringeasyTwo PointersString9 companies
- Find the CelebritymediumTwo PointersGraph TheoryInteractive9 companies
- Single Element in a Sorted ArraymediumArrayBinary Search9 companies
- Burst BalloonshardArrayDynamic Programming9 companies
- Remove K DigitsmediumStringStackGreedyMonotonic Stack9 companies
- Minimum Cost For TicketsmediumArrayDynamic Programming9 companies
- MinesweepermediumArrayDepth-First SearchBreadth-First SearchMatrix9 companies
- Copy List with Random PointermediumHash TableLinked List9 companies
- HeatersmediumArrayTwo PointersBinary SearchSorting9 companies
- First Unique Character in a StringeasyHash TableStringQueueCounting9 companies
- Set Matrix ZeroesmediumArrayHash TableMatrix9 companies
- Linked List CycleeasyHash TableLinked ListTwo PointersFloyd's Cycle Finding Algorithm9 companies
- Power of TwoeasyMathBit ManipulationRecursion9 companies
- Middle of the Linked ListeasyLinked ListTwo Pointers9 companies
- Palindrome Linked ListeasyLinked ListTwo PointersStackRecursion9 companies
- Reverse IntegermediumMath9 companies
- Can Place FlowerseasyArrayGreedy9 companies
- Contains Duplicate IIeasyArrayHash TableSliding Window9 companies
- My Calendar ImediumArrayBinary SearchDesignSegment Tree+19 companies
- Unique Paths IImediumArrayDynamic ProgrammingMatrix9 companies
- Range Sum Query 2D - ImmutablemediumArrayDesignMatrixPrefix Sum9 companies
- Contains DuplicateeasyArrayHash TableSorting9 companies
- SubsetsmediumArrayBacktrackingBit Manipulation9 companies
- Maximum Product of Three NumberseasyArrayMathSorting9 companies
- Is SubsequenceeasyTwo PointersStringDynamic Programming9 companies
- Exclusive Time of FunctionsmediumArrayStack9 companies
- Sliding Window MedianhardArrayHash TableSliding WindowHeap (Priority Queue)+19 companies
- Basic Calculator IIIhardMathStringStackRecursion9 companies
- Fruit Into BasketsmediumArrayHash TableSliding Window9 companies
- Largest NumbermediumArrayStringGreedySorting9 companies
- Add StringseasyMathStringSimulation9 companies
- Robot Bounded In CirclemediumMathStringSimulation9 companies
- Single NumbereasyArrayBit Manipulation9 companies
- Find Pivot IndexeasyArrayPrefix Sum9 companies
- Meeting Rooms IIIhardArrayHash TableSortingHeap (Priority Queue)+19 companies
- Count Binary SubstringseasyTwo PointersString9 companies
- Next Greater Element IeasyArrayHash TableStackMonotonic Stack9 companies
- Edit DistancemediumStringDynamic Programming9 companies
- Binary Tree Level Order TraversalmediumTreeBreadth-First SearchBinary Tree9 companies
- Missing NumbereasyArrayHash TableMathBinary Search+29 companies
- Next Greater Element IImediumArrayStackMonotonic Stack9 companies
- Maximum Number of Events That Can Be AttendedmediumArrayGreedySortingHeap (Priority Queue)9 companies
- 01 MatrixmediumArrayDynamic ProgrammingBreadth-First SearchMatrix9 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.