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
1,399 questions at Meta · all time
- Find Longest Special Substring That Occurs Thrice ImediumHash TableStringBinary SearchSliding Window+1frequency 11.4
- Find if Array Can Be SortedmediumArrayBit ManipulationSortingfrequency 11.4
- Find in Mountain ArrayhardArrayBinary SearchInteractiveTernary Searchfrequency 11.4
- Find the Difference of Two ArrayseasyArrayHash Tablefrequency 11.4
- Find the Largest Area of Square Inside Two RectanglesmediumArrayMathGeometryfrequency 11.4
- Find the Lexicographically Largest String From the Box ImediumTwo PointersStringEnumerationfrequency 11.4
- Find the Longest Substring Containing Vowels in Even CountsmediumHash TableStringBit ManipulationPrefix Sumfrequency 11.4
- Find the Number of Subsequences With Equal GCDhardArrayMathDynamic ProgrammingNumber Theory+2frequency 11.4
- Find the Original Typed String IeasyStringfrequency 11.4
- Find the PeakseasyArrayEnumerationfrequency 11.4
- Find the XOR of Numbers Which Appear TwiceeasyArrayHash TableBit Manipulationfrequency 11.4
- Flatten Deeply Nested Arraymediumfrequency 11.4
- Flipping an ImageeasyArrayTwo PointersBit ManipulationMatrix+1frequency 11.4
- Four DivisorsmediumArrayMathPrime FactorizationSieve Theoryfrequency 11.4
- House Robber IVmediumArrayBinary SearchDynamic ProgrammingGreedyfrequency 11.4
- Human Traffic of StadiumhardDatabasefrequency 11.4
- Insert Greatest Common Divisors in Linked ListmediumLinked ListMathNumber Theoryfrequency 11.4
- Jump Game IVhardArrayHash TableBreadth-First Searchfrequency 11.4
- Keys and RoomsmediumDepth-First SearchBreadth-First SearchGraph Theoryfrequency 11.4
- Largest Perimeter TriangleeasyArrayMathGreedySorting+2frequency 11.4
- Last Day Where You Can Still CrosshardArrayBinary SearchDepth-First SearchBreadth-First Search+2frequency 11.4
- Longest Balanced Substring ImediumHash TableStringCountingEnumerationfrequency 11.4
- Longest Balanced Substring IImediumHash TableStringPrefix Sumfrequency 11.4
- Longest Happy PrefixhardStringRolling HashString MatchingHash Function+2frequency 11.4
- Longest String ChainmediumArrayHash TableTwo PointersString+2frequency 11.4
- Longest Substring with At Most K Distinct CharactersmediumHash TableStringSliding Windowfrequency 11.4
- Matchsticks to SquaremediumArrayDynamic ProgrammingBacktrackingBit Manipulation+1frequency 11.4
- Max StackhardLinked ListStackDesignDoubly-Linked List+1frequency 11.4
- Maximum 69 NumbereasyMathGreedyfrequency 11.4
- Maximum Building HeighthardArrayMathSortingfrequency 11.4
- Maximum Earnings From TaximediumArrayHash TableBinary SearchDynamic Programming+1frequency 11.4
- Maximum Matching of Players With TrainersmediumArrayTwo PointersGreedySortingfrequency 11.4
- Maximum Matrix SummediumArrayGreedyMatrixfrequency 11.4
- Maximum Number of Vowels in a Substring of Given LengthmediumStringSliding Windowfrequency 11.4
- Maximum XOR of Two Numbers in an ArraymediumArrayHash TableBit ManipulationTriefrequency 11.4
- Meeting Rooms IIIhardArrayHash TableSortingHeap (Priority Queue)+1frequency 11.4
- Minimum Absolute Distance Between Mirror PairsmediumArrayHash TableMathfrequency 11.4
- Minimum Bit Flips to Convert NumbereasyBit Manipulationfrequency 11.4
- Minimum Cost Path with TeleportationshardArrayDynamic ProgrammingMatrixfrequency 11.4
- Minimum Cost of Buying Candies With DiscounteasyArrayGreedySortingfrequency 11.4
- Minimum Element After Replacement With Digit SumeasyArrayMathfrequency 11.4
- Minimum Genetic MutationmediumHash TableStringBreadth-First SearchBidirectional Searchfrequency 11.4
- Minimum Height TreesmediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sortfrequency 11.4
- Minimum Insertions to Balance a Parentheses StringmediumStringStackGreedyBracket Sequencesfrequency 11.4
- Minimum Limit of Balls in a BagmediumArrayBinary Searchfrequency 11.4
- Minimum Moves to Equal Array ElementsmediumArrayMathfrequency 11.4
- Minimum Number of Flips to Make the Binary String AlternatingmediumStringDynamic ProgrammingSliding Windowfrequency 11.4
- Minimum Number of Vertices to Reach All NodesmediumGraph TheoryDirected Acyclic Graphfrequency 11.4
- Minimum Operations to Make Array Sum Divisible by KeasyArrayMathfrequency 11.4
- Minimum Time to Repair CarsmediumArrayBinary Searchfrequency 11.4
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.