Problems
Callback's own problems and the LeetCode questions companies have been asking, in one place — pick a category, then filter by company, frequency, status, difficulty, topic, and language.
Asked on LeetCode
3,115 questions · all time
- Max Consecutive Ones IIImediumArrayBinary SearchSliding WindowPrefix Sum13 companies
- Valid PalindromeeasyTwo PointersString13 companies
- Shortest Path in Binary MatrixmediumArrayBreadth-First SearchMatrix13 companies
- Max Area of IslandmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+113 companies
- Next PermutationmediumArrayTwo Pointers13 companies
- Sqrt(x)easyMathBinary SearchNewton's Method13 companies
- House Robber IImediumArrayDynamic Programming13 companies
- Validate Binary Search TreemediumTreeDepth-First SearchBinary Search TreeBinary Tree13 companies
- Valid AnagrameasyHash TableStringSorting13 companies
- Jump GamemediumArrayDynamic ProgrammingGreedy13 companies
- Maximum Product SubarraymediumArrayDynamic Programming13 companies
- Sort ColorsmediumArrayTwo PointersSortingQuicksort+113 companies
- Jump Game IImediumArrayDynamic ProgrammingGreedy13 companies
- Unique PathsmediumMathDynamic ProgrammingCombinatorics13 companies
- Design Browser HistorymediumArrayLinked ListStackDesign+212 companies
- Evaluate Reverse Polish NotationmediumArrayMathStack12 companies
- Gas StationmediumArrayGreedy12 companies
- Happy NumbereasyHash TableMathTwo PointersFloyd's Cycle Finding Algorithm12 companies
- Max Points on a LinehardArrayHash TableMathGeometry+212 companies
- Shortest Distance from All BuildingshardArrayBreadth-First SearchMatrix12 companies
- Valid Palindrome IIeasyTwo PointersStringGreedy12 companies
- All O`one Data StructurehardHash TableLinked ListDesignDoubly-Linked List12 companies
- Design Tic-Tac-ToemediumArrayHash TableDesignMatrix+112 companies
- Longest Increasing Path in a MatrixhardArrayDynamic ProgrammingDepth-First SearchBreadth-First Search+512 companies
- Reorganize StringmediumHash TableStringGreedySorting+212 companies
- Subarray Product Less Than KmediumArrayBinary SearchSliding WindowPrefix Sum12 companies
- Find the Duplicate NumbermediumArrayTwo PointersBinary SearchBit Manipulation+212 companies
- All Nodes Distance K in Binary TreemediumHash TableTreeDepth-First SearchBreadth-First Search+112 companies
- Non-overlapping IntervalsmediumArrayDynamic ProgrammingGreedySorting12 companies
- Design Add and Search Words Data StructuremediumStringDepth-First SearchDesignTrie12 companies
- Cheapest Flights Within K StopsmediumDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph Theory+212 companies
- Shortest Path in a Grid with Obstacles EliminationhardArrayBreadth-First SearchMatrix12 companies
- Open the LockmediumArrayHash TableStringBreadth-First Search+112 companies
- Design Search Autocomplete SystemhardStringDepth-First SearchDesignTrie+312 companies
- Word Ladder IIhardHash TableStringBacktrackingBreadth-First Search+112 companies
- Longest Repeating Character ReplacementmediumHash TableStringSliding Window12 companies
- Binary Tree Zigzag Level Order TraversalmediumTreeBreadth-First SearchBinary Tree12 companies
- PermutationsmediumArrayBacktracking12 companies
- The MazemediumArrayDepth-First SearchBreadth-First SearchMatrix12 companies
- Bus RouteshardArrayHash TableBreadth-First Search11 companies
- Daily TemperaturesmediumArrayStackMonotonic Stack11 companies
- Interval List IntersectionsmediumArrayTwo PointersSweep Line11 companies
- K Closest Points to OriginmediumArrayMathDivide and ConquerGeometry+411 companies
- Reverse Nodes in k-GrouphardLinked ListRecursion11 companies
- Optimal Account BalancinghardArrayDynamic ProgrammingBacktrackingBit Manipulation+111 companies
- Multiply StringsmediumMathStringSimulation11 companies
- Wildcard MatchinghardStringDynamic ProgrammingGreedyRecursion11 companies
- Diameter of Binary TreeeasyTreeDepth-First SearchBinary TreeDP on Trees11 companies
- Number of 1 BitseasyDivide and ConquerBit Manipulation11 companies
- Reverse Words in a StringmediumTwo PointersString11 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.