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
- Time Needed to Rearrange a Binary StringmediumStringDynamic ProgrammingSimulationfrequency 20.0
- Trips and UsershardDatabasefrequency 20.0
- Users With Two Purchases Within Seven DaysmediumDatabasefrequency 20.0
- Valid Palindrome IVmediumTwo PointersStringfrequency 20.0
- Warehouse ManagereasyDatabasefrequency 20.0
- Add Two Numbers IImediumLinked ListMathStackfrequency 18.0
- Apply Operations to an ArrayeasyArrayTwo PointersSimulationfrequency 18.0
- As Far from Land as PossiblemediumArrayDynamic ProgrammingBreadth-First SearchMatrixfrequency 18.0
- Best Time to Buy and Sell Stock with CooldownmediumArrayDynamic Programmingfrequency 18.0
- Buildings With an Ocean ViewmediumArrayStackMonotonic Stackfrequency 18.0
- Can I WinmediumMathDynamic ProgrammingBit ManipulationMemoization+2frequency 18.0
- Champagne TowermediumDynamic Programmingfrequency 18.0
- Cherry PickuphardArrayDynamic ProgrammingMatrixfrequency 18.0
- Cherry Pickup IIhardArrayDynamic ProgrammingMatrixfrequency 18.0
- Count Vowel Strings in RangesmediumArrayStringPrefix Sumfrequency 18.0
- Create Binary Tree From DescriptionsmediumArrayHash TableTreeBinary Treefrequency 18.0
- Delete Nodes From Linked List Present in ArraymediumArrayHash TableLinked Listfrequency 18.0
- Design Task ManagermediumHash TableDesignHeap (Priority Queue)Ordered Setfrequency 18.0
- Detect Cycles in 2D GridmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 18.0
- Detonate the Maximum BombsmediumArrayMathDepth-First SearchBreadth-First Search+2frequency 18.0
- Elimination GamemediumMathRecursionfrequency 18.0
- Even Odd TreemediumTreeBreadth-First SearchBinary Treefrequency 18.0
- Find All K-Distant Indices in an ArrayeasyArrayTwo Pointersfrequency 18.0
- Find Largest Value in Each Tree RowmediumTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 18.0
- Find Winner on a Tic Tac Toe GameeasyArrayHash TableMatrixSimulationfrequency 18.0
- Find the Closest PalindromehardMathStringfrequency 18.0
- Find the Difference of Two ArrayseasyArrayHash Tablefrequency 18.0
- Find the Maximum Achievable NumbereasyMathfrequency 18.0
- Find the Town JudgeeasyArrayHash TableGraph Theoryfrequency 18.0
- Find the Winner of the Circular GamemediumArrayMathRecursionQueue+1frequency 18.0
- Fruits Into Baskets IIeasyArrayBinary SearchSegment TreeSimulation+1frequency 18.0
- Game Play Analysis IeasyDatabasefrequency 18.0
- Greatest Sum Divisible by ThreemediumArrayDynamic ProgrammingGreedySortingfrequency 18.0
- Hand of StraightsmediumArrayHash TableGreedySortingfrequency 18.0
- Human Traffic of StadiumhardDatabasefrequency 18.0
- Jump Game VIImediumStringDynamic ProgrammingSliding WindowPrefix Sumfrequency 18.0
- K-th Symbol in GrammarmediumMathBit ManipulationRecursionfrequency 18.0
- Kth Smallest Product of Two Sorted ArrayshardArrayBinary Searchfrequency 18.0
- Largest 1-Bordered SquaremediumArrayDynamic ProgrammingMatrixfrequency 18.0
- Lexicographically Smallest Equivalent StringmediumStringUnion-Findfrequency 18.0
- Lexicographically Smallest Permutation Greater Than TargetmediumHash TableStringGreedyCounting+1frequency 18.0
- Lexicographically Smallest String After Applying OperationsmediumStringDepth-First SearchBreadth-First SearchEnumerationfrequency 18.0
- Longest Balanced Substring ImediumHash TableStringCountingEnumerationfrequency 18.0
- Longest Happy StringmediumStringGreedyHeap (Priority Queue)frequency 18.0
- Longest Nice SubarraymediumArrayBit ManipulationSliding Windowfrequency 18.0
- Longest Substring with At Most K Distinct CharactersmediumHash TableStringSliding Windowfrequency 18.0
- Map of Highest PeakmediumArrayBreadth-First SearchMatrixfrequency 18.0
- Maximize Active Section with Trade ImediumStringEnumerationfrequency 18.0
- Maximum Absolute Sum of Any SubarraymediumArrayDynamic Programmingfrequency 18.0
- Maximum GapmediumArraySortingBucket SortRadix Sort+1frequency 18.0
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.