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
- The MazemediumArrayDepth-First SearchBreadth-First SearchMatrixfrequency 10.3
- The Two Sneaky Numbers of DigitvilleeasyArrayHash TableMathfrequency 10.3
- Time Needed to Buy TicketseasyArrayQueueSimulationfrequency 10.3
- Total Waviness of Numbers in Range IIhardMathDynamic Programmingfrequency 10.3
- Two City SchedulingmediumArrayGreedySortingHungarian Algorithm+1frequency 10.3
- Two Furthest Houses With Different ColorseasyArrayGreedyfrequency 10.3
- Water BottleseasyMathSimulationfrequency 10.3
- Water and Jug ProblemmediumMathDepth-First SearchBreadth-First SearchBézout's Lemma+3frequency 10.3
- Wiggle Sort IImediumArrayDivide and ConquerGreedySorting+1frequency 10.3
- XOR After Range Multiplication Queries ImediumArrayDivide and ConquerSimulationPrefix Sumfrequency 10.3
- Zigzag IteratormediumArrayDesignQueueIteratorfrequency 10.3
- 3Sum With MultiplicitymediumArrayHash TableTwo PointersSorting+1frequency 7.2
- All People Report to the Given ManagermediumDatabasefrequency 7.2
- Alternating Digit SumeasyMathfrequency 7.2
- Analyze Organization HierarchyhardDatabasefrequency 7.2
- Apply Transform Over Each Element in Arrayeasyfrequency 7.2
- Bag of TokensmediumArrayTwo PointersGreedySortingfrequency 7.2
- Binary Number with Alternating BitseasyBit Manipulationfrequency 7.2
- Binary Tree Coloring GamemediumTreeDepth-First SearchBinary Treefrequency 7.2
- Binary Tree TilteasyTreeDepth-First SearchBinary TreeDP on Treesfrequency 7.2
- Calculate Money in Leetcode BankeasyMathfrequency 7.2
- Car Fleet IIhardArrayMathStackHeap (Priority Queue)+1frequency 7.2
- Check Balanced StringeasyStringfrequency 7.2
- Check If It Is a Straight LineeasyArrayMathGeometryfrequency 7.2
- Check If Two String Arrays are EquivalenteasyArrayStringfrequency 7.2
- Check if All Characters Have Equal Number of OccurrenceseasyHash TableStringCountingfrequency 7.2
- Check if All the Integers in a Range Are CoveredeasyArrayHash TablePrefix Sumfrequency 7.2
- Check if Grid can be Cut into SectionsmediumArraySortingfrequency 7.2
- Check if Two Chessboard Squares Have the Same ColoreasyMathStringfrequency 7.2
- Circular Array LoopmediumArrayHash TableTwo PointersFloyd's Cycle Finding Algorithmfrequency 7.2
- Closest Binary Search Tree Value IIhardTwo PointersStackTreeDepth-First Search+3frequency 7.2
- Construct K Palindrome StringsmediumHash TableStringGreedyCountingfrequency 7.2
- Construct the RectangleeasyMathfrequency 7.2
- Convert a Number to HexadecimaleasyMathStringBit Manipulationfrequency 7.2
- Count Collisions of Monkeys on a PolygonmediumMathRecursionfrequency 7.2
- Count Largest GroupeasyHash TableMathCountingfrequency 7.2
- Count Nodes Equal to Average of SubtreemediumTreeDepth-First SearchBinary Treefrequency 7.2
- Count Nodes With the Highest ScoremediumArrayTreeDepth-First SearchBinary Tree+1frequency 7.2
- Count Odd Numbers in an Interval RangeeasyMathfrequency 7.2
- Count Operations to Obtain ZeroeasyMathSimulationfrequency 7.2
- Count Salary CategoriesmediumDatabasefrequency 7.2
- Count Symmetric IntegerseasyMathEnumerationfrequency 7.2
- Count Unique Characters of All Substrings of a Given StringhardHash TableStringDynamic Programmingfrequency 7.2
- Count Ways To Build Good StringsmediumDynamic Programmingfrequency 7.2
- Count of Substrings Containing Every Vowel and K Consonants IImediumHash TableStringSliding Windowfrequency 7.2
- Count the Number of Good SubarraysmediumArrayHash TableSliding Windowfrequency 7.2
- Count the Number of Ideal ArrayshardMathDynamic ProgrammingCombinatoricsNumber Theory+2frequency 7.2
- Data Stream as Disjoint IntervalshardHash TableBinary SearchUnion-FindDesign+2frequency 7.2
- Decode the MessageeasyHash TableStringfrequency 7.2
- Degree of an ArrayeasyArrayHash Tablefrequency 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.