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
- Design HashSeteasyArrayHash TableLinked ListDesign+1frequency 7.2
- Determine if Two Strings Are ClosemediumHash TableStringSortingCountingfrequency 7.2
- Difference Between Element Sum and Digit Sum of an ArrayeasyArrayMathfrequency 7.2
- Dinner Plate StackshardHash TableStackDesignHeap (Priority Queue)frequency 7.2
- Display the First Three Rowseasyfrequency 7.2
- Divide Array Into Equal PairseasyArrayHash TableBit ManipulationCountingfrequency 7.2
- Divide Nodes Into the Maximum Number of GroupshardDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 7.2
- Divide an Array Into Subarrays With Minimum Cost IIhardArrayHash TableSliding WindowHeap (Priority Queue)frequency 7.2
- Dot Product of Two Sparse VectorsmediumArrayHash TableTwo PointersDesign+1frequency 7.2
- Escape a Large MazehardArrayHash TableDepth-First SearchBreadth-First Search+1frequency 7.2
- Fancy SequencehardMathDesignSegment TreeNumber Theory+1frequency 7.2
- Find All Possible Stable Binary Arrays IIhardDynamic ProgrammingPrefix Sumfrequency 7.2
- Find Bottom Left Tree ValuemediumTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 7.2
- Find Building Where Alice and Bob Can MeethardArrayBinary SearchStackBinary Indexed Tree+3frequency 7.2
- Find Closest PersoneasyMathfrequency 7.2
- Find Followers CounteasyDatabasefrequency 7.2
- Find Minimum Operations to Make All Elements Divisible by ThreeeasyArrayMathfrequency 7.2
- Find Minimum Time to Reach Last Room IImediumArrayGraph TheoryHeap (Priority Queue)Matrix+1frequency 7.2
- Find Mode in Binary Search TreeeasyTreeDepth-First SearchBinary Search TreeBinary Treefrequency 7.2
- Find Most Frequent Vowel and ConsonanteasyHash TableStringCountingfrequency 7.2
- Find Words Containing CharactereasyArrayStringfrequency 7.2
- Find the K-th Character in String Game IIhardMathBit ManipulationRecursionfrequency 7.2
- Find the Kth Smallest Sum of a Matrix With Sorted RowshardArrayBinary SearchHeap (Priority Queue)Matrixfrequency 7.2
- Find the Lexicographically Largest String From the Box ImediumTwo PointersStringEnumerationfrequency 7.2
- Find the Lexicographically Smallest Valid SequencemediumTwo PointersStringDynamic ProgrammingGreedyfrequency 7.2
- Find the Number of Distinct Colors Among the BallsmediumArrayHash TableSimulationfrequency 7.2
- Find the Safest Path in a GridmediumArrayBinary SearchBreadth-First SearchUnion-Find+2frequency 7.2
- Finding Pairs With a Certain SummediumArrayHash TableDesignfrequency 7.2
- Finding the Users Active MinutesmediumArrayHash Tablefrequency 7.2
- Flip Columns For Maximum Number of Equal RowsmediumArrayHash TableMatrixfrequency 7.2
- Friends Of Appropriate AgesmediumArrayTwo PointersBinary SearchSortingfrequency 7.2
- Get Maximum in Generated ArrayeasyArraySimulationfrequency 7.2
- Graph Valid TreemediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 7.2
- Grid GamemediumArrayMatrixPrefix Sumfrequency 7.2
- Grid Teleportation TraversalmediumArrayHash TableBreadth-First SearchMatrixfrequency 7.2
- Group Sold Products By The DateeasyDatabasefrequency 7.2
- Group the People Given the Group Size They Belong TomediumArrayHash TableGreedyfrequency 7.2
- Happy StudentsmediumArraySortingEnumerationfrequency 7.2
- Height CheckereasyArraySortingCounting SortBubble Sortfrequency 7.2
- Increasing Order Search TreeeasyStackTreeDepth-First SearchBinary Search Tree+1frequency 7.2
- Jump Game IXmediumArrayDynamic Programmingfrequency 7.2
- Jump Game VhardArrayDynamic ProgrammingSortingfrequency 7.2
- Keyboard RoweasyArrayHash TableStringfrequency 7.2
- Kth Ancestor of a Tree NodehardBinary SearchDynamic ProgrammingBit ManipulationTree+4frequency 7.2
- Largest Combination With Bitwise AND Greater Than ZeromediumArrayHash TableBit ManipulationCountingfrequency 7.2
- Largest Submatrix With RearrangementsmediumArrayGreedySortingMatrixfrequency 7.2
- Left and Right Sum DifferenceseasyArrayPrefix Sumfrequency 7.2
- Longest Absolute File PathmediumStringStackDepth-First Searchfrequency 7.2
- Longest Balanced Subarray IIhardArrayHash TableDivide and ConquerSegment Tree+1frequency 7.2
- Longest Binary Subsequence Less Than or Equal to KmediumStringDynamic ProgrammingGreedyMemoizationfrequency 7.2
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.