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
2,011 questions at Amazon · all time
- Construct Quad TreemediumArrayDivide and ConquerTreeMatrixfrequency 10.3
- Construct the Lexicographically Largest Valid SequencemediumArrayBacktrackingfrequency 10.3
- Construct the Minimum Bitwise Array IeasyArrayBit Manipulationfrequency 10.3
- Count Good TripletseasyArrayEnumerationfrequency 10.3
- Count Pairs Whose Sum is Less than TargeteasyArrayTwo PointersBinary SearchSortingfrequency 10.3
- Count Partitions With Max-Min Difference at Most KmediumArrayDynamic ProgrammingQueueSliding Window+2frequency 10.3
- Count Subarrays Where Max Element Appears at Least K TimesmediumArraySliding Windowfrequency 10.3
- Count Subarrays With Fixed BoundshardArrayQueueSliding WindowMonotonic Queuefrequency 10.3
- Count Subarrays With Score Less Than KhardArrayBinary SearchSliding WindowPrefix Sumfrequency 10.3
- Count Univalue SubtreesmediumTreeDepth-First SearchBinary TreeDP on Treesfrequency 10.3
- Count of Matches in TournamenteasyMathSimulationfrequency 10.3
- Count the Digits That Divide a NumbereasyMathfrequency 10.3
- Count the Number of Complete ComponentsmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 10.3
- Counter IIeasyfrequency 10.3
- Create Maximum NumberhardArrayTwo PointersStackGreedy+1frequency 10.3
- DI String MatcheasyArrayTwo PointersStringGreedyfrequency 10.3
- Daily Leads and PartnerseasyDatabasefrequency 10.3
- Delete Characters to Make Fancy StringeasyStringfrequency 10.3
- Delete Columns to Make Sorted IImediumArrayStringGreedyfrequency 10.3
- Delete Nodes And Return ForestmediumArrayHash TableTreeDepth-First Search+1frequency 10.3
- Delete Operation for Two StringsmediumStringDynamic ProgrammingLongest Common Subsequencefrequency 10.3
- Design A LeaderboardmediumHash TableDesignSortingfrequency 10.3
- Design Excel Sum FormulahardArrayHash TableStringGraph Theory+3frequency 10.3
- Design Log Storage SystemmediumHash TableStringDesignOrdered Setfrequency 10.3
- Design Underground SystemmediumHash TableStringDesignfrequency 10.3
- Destination CityeasyArrayHash TableStringfrequency 10.3
- Distinct Subsequences IIhardStringDynamic Programmingfrequency 10.3
- Duplicate ZeroseasyArrayTwo Pointersfrequency 10.3
- Employee ImportancemediumArrayHash TableTreeDepth-First Search+1frequency 10.3
- Expression Add OperatorshardMathStringBacktrackingfrequency 10.3
- Extra Characters in a StringmediumArrayHash TableStringDynamic Programming+1frequency 10.3
- Find Greatest Common Divisor of ArrayeasyArrayMathNumber TheoryEuclidean Algorithm+1frequency 10.3
- Find Leaves of Binary TreemediumTreeDepth-First SearchBinary TreeDP on Treesfrequency 10.3
- Find Lucky Integer in an ArrayeasyArrayHash TableCountingfrequency 10.3
- Find Minimum in Rotated Sorted Array IIhardArrayBinary Searchfrequency 10.3
- Find Score of an Array After Marking All ElementsmediumArrayHash TableSortingHeap (Priority Queue)+1frequency 10.3
- Find Servers That Handled Most Number of RequestshardArrayHeap (Priority Queue)SimulationOrdered Setfrequency 10.3
- Find Unique Binary StringmediumArrayHash TableStringBacktrackingfrequency 10.3
- Find Users With Valid E-MailseasyDatabasefrequency 10.3
- Find X-Sum of All K-Long Subarrays IeasyArrayHash TableSliding WindowHeap (Priority Queue)frequency 10.3
- Find the City With the Smallest Number of Neighbors at a Threshold DistancemediumDynamic ProgrammingGraph TheoryShortest PathDijkstra's Algorithm+2frequency 10.3
- Find the Middle Index in ArrayeasyArrayPrefix Sumfrequency 10.3
- Find the Minimum Amount of Time to Brew PotionsmediumArraySimulationPrefix Sumfrequency 10.3
- Find the Minimum and Maximum Number of Nodes Between Critical PointsmediumLinked Listfrequency 10.3
- Finding 3-Digit Even NumberseasyArrayHash TableRecursionSorting+1frequency 10.3
- Flipping an ImageeasyArrayTwo PointersBit ManipulationMatrix+1frequency 10.3
- Get Biggest Three Rhombus Sums in a GridmediumArrayMathSortingHeap (Priority Queue)+2frequency 10.3
- Integer BreakmediumMathDynamic Programmingfrequency 10.3
- Jump Game IIImediumArrayDepth-First SearchBreadth-First Searchfrequency 10.3
- Knight DialermediumDynamic Programmingfrequency 10.3
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.