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
2,344 questions at Google · all time
- Course Schedule IIIhardArrayGreedySortingHeap (Priority Queue)frequency 5.0
- DNA Pattern RecognitionmediumDatabasefrequency 5.0
- Daily Leads and PartnerseasyDatabasefrequency 5.0
- Decode XORed ArrayeasyArrayBit Manipulationfrequency 5.0
- Decrypt String from Alphabet to Integer MappingeasyStringfrequency 5.0
- Design Front Middle Back QueuemediumArrayLinked ListDesignQueue+2frequency 5.0
- Design Memory AllocatormediumArrayHash TableDesignSimulationfrequency 5.0
- Dice Roll SimulationhardArrayDynamic Programmingfrequency 5.0
- Differences Between Two Objectsmediumfrequency 5.0
- Digit Operations to Make Two Integers EqualmediumMathGraph TheoryHeap (Priority Queue)Number Theory+1frequency 5.0
- Dinner Plate StackshardHash TableStackDesignHeap (Priority Queue)frequency 5.0
- Distinct Prime Factors of Product of ArraymediumArrayHash TableMathNumber Theory+6frequency 5.0
- Distribute CandieseasyArrayHash Tablefrequency 5.0
- Distribute Money to Maximum ChildreneasyMathGreedyfrequency 5.0
- Double a Number Represented as a Linked ListmediumLinked ListMathStackfrequency 5.0
- Earliest Second to Mark Indices IIhardArrayBinary SearchGreedyHeap (Priority Queue)frequency 5.0
- Employees With Missing InformationeasyDatabasefrequency 5.0
- Encrypt and Decrypt StringshardArrayHash TableStringDesign+1frequency 5.0
- Escape a Large MazehardArrayHash TableDepth-First SearchBreadth-First Search+1frequency 5.0
- Evaluate Valid ExpressionshardHash TableMathStringDivide and Conquer+1frequency 5.0
- Fill Missing Dataeasyfrequency 5.0
- Final Array State After K Multiplication Operations IeasyArrayMathHeap (Priority Queue)Simulationfrequency 5.0
- Final Array State After K Multiplication Operations IIhardArrayHeap (Priority Queue)Simulationfrequency 5.0
- Find All Groups of FarmlandmediumArrayDepth-First SearchBreadth-First SearchMatrixfrequency 5.0
- Find COVID Recovery PatientsmediumDatabasefrequency 5.0
- Find Duplicate File in SystemmediumArrayHash TableStringfrequency 5.0
- Find Maximum Area of a TrianglemediumArrayHash TableMathGreedy+2frequency 5.0
- Find Maximum Non-decreasing Array LengthhardArrayBinary SearchDynamic ProgrammingStack+4frequency 5.0
- Find Maximum Removals From Source StringmediumArrayHash TableTwo PointersString+1frequency 5.0
- Find Minimum Cost to Remove Array ElementsmediumArrayDynamic Programmingfrequency 5.0
- Find Minimum Time to Reach Last Room IImediumArrayGraph TheoryHeap (Priority Queue)Matrix+1frequency 5.0
- Find Mirror Score of a StringmediumHash TableStringStackSimulationfrequency 5.0
- Find Missing ObservationsmediumArrayMathSimulationfrequency 5.0
- Find Servers That Handled Most Number of RequestshardArrayHeap (Priority Queue)SimulationOrdered Setfrequency 5.0
- Find Subarrays With Equal SumeasyArrayHash Tablefrequency 5.0
- Find Substring With Given Hash ValuehardStringSliding WindowRolling HashHash Functionfrequency 5.0
- Find Valid Pair of Adjacent Digits in StringeasyHash TableStringCountingfrequency 5.0
- Find the Distance Value Between Two ArrayseasyArrayTwo PointersBinary SearchSortingfrequency 5.0
- Find the K-Beauty of a NumbereasyMathStringSliding Windowfrequency 5.0
- Find the K-Sum of an ArrayhardArraySortingHeap (Priority Queue)frequency 5.0
- Find the Kth Largest Integer in the ArraymediumArrayStringDivide and ConquerSorting+2frequency 5.0
- Find the Largest Almost Missing IntegereasyArrayHash Tablefrequency 5.0
- Find the Largest Palindrome Divisible by KhardMathStringDynamic ProgrammingGreedy+1frequency 5.0
- Find the Number of Copy ArraysmediumArrayMathfrequency 5.0
- Find the PeakseasyArrayEnumerationfrequency 5.0
- Find the Smallest Balanced IndexmediumArrayPrefix Sumfrequency 5.0
- Find the Sum of the Power of All SubsequenceshardArrayDynamic ProgrammingKnapsack Problem0-1 Knapsackfrequency 5.0
- Find the XOR of Numbers Which Appear TwiceeasyArrayHash TableBit Manipulationfrequency 5.0
- First Unique NumbermediumArrayHash TableDesignQueue+1frequency 5.0
- Fizz Buzz MultithreadedmediumConcurrencyfrequency 5.0
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.