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
- Gas StationmediumArrayGreedy12 companies
- Integer to English WordshardMathStringRecursion12 companies
- Max Points on a LinehardArrayHash TableMathGeometry+212 companies
- Shortest BridgemediumArrayDepth-First SearchBreadth-First SearchMatrix12 companies
- Shortest Distance from All BuildingshardArrayBreadth-First SearchMatrix12 companies
- Simplify PathmediumStringStack12 companies
- Valid Palindrome IIeasyTwo PointersStringGreedy12 companies
- All O`one Data StructurehardHash TableLinked ListDesignDoubly-Linked List12 companies
- Palindromic SubstringsmediumTwo PointersStringDynamic Programming12 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
- Word Search IIhardArrayStringBacktrackingTrie+112 companies
- Valid PalindromeeasyTwo PointersString12 companies
- Max Area of IslandmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+112 companies
- Shortest Path in a Grid with Obstacles EliminationhardArrayBreadth-First SearchMatrix12 companies
- House Robber IImediumArrayDynamic Programming12 companies
- Open the LockmediumArrayHash TableStringBreadth-First Search+112 companies
- Validate Binary Search TreemediumTreeDepth-First SearchBinary Search TreeBinary Tree12 companies
- Valid AnagrameasyHash TableStringSorting12 companies
- Jump GamemediumArrayDynamic ProgrammingGreedy12 companies
- Maximum Product SubarraymediumArrayDynamic Programming12 companies
- Design Search Autocomplete SystemhardStringDepth-First SearchDesignTrie+312 companies
- Word Ladder IIhardHash TableStringBacktrackingBreadth-First Search+112 companies
- Sort ColorsmediumArrayTwo PointersSortingQuicksort+112 companies
- Jump Game IImediumArrayDynamic ProgrammingGreedy12 companies
- Unique PathsmediumMathDynamic ProgrammingCombinatorics12 companies
- Binary Tree Zigzag Level Order TraversalmediumTreeBreadth-First SearchBinary Tree12 companies
- PermutationsmediumArrayBacktracking12 companies
- Bus RouteshardArrayHash TableBreadth-First Search11 companies
- Daily TemperaturesmediumArrayStackMonotonic Stack11 companies
- Design Browser HistorymediumArrayLinked ListStackDesign+211 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
- Happy NumbereasyHash TableMathTwo PointersFloyd's Cycle Finding Algorithm11 companies
- Multiply StringsmediumMathStringSimulation11 companies
- Wildcard MatchinghardStringDynamic ProgrammingGreedyRecursion11 companies
- Diameter of Binary TreeeasyTreeDepth-First SearchBinary TreeDP on Trees11 companies
- Non-overlapping IntervalsmediumArrayDynamic ProgrammingGreedySorting11 companies
- Design Add and Search Words Data StructuremediumStringDepth-First SearchDesignTrie11 companies
- Reverse Words in a StringmediumTwo PointersString11 companies
- Cheapest Flights Within K StopsmediumDynamic ProgrammingDepth-First SearchBreadth-First SearchGraph Theory+211 companies
- Combination Sum IImediumArrayBacktracking11 companies
- Dot Product of Two Sparse VectorsmediumArrayHash TableTwo PointersDesign+111 companies
- Longest Valid ParentheseshardStringDynamic ProgrammingStackBracket Sequences11 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.