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
3,110 questions · all time
- Split Array With Same AveragehardArrayHash TableMathDynamic Programming+33 companies
- Even Odd TreemediumTreeBreadth-First SearchBinary Tree3 companies
- Paint FencemediumDynamic Programming3 companies
- Find Longest Special Substring That Occurs Thrice ImediumHash TableStringBinary SearchSliding Window+13 companies
- Flatten Deeply Nested Arraymedium3 companies
- Minimum Moves to Spread Stones Over GridmediumArrayDynamic ProgrammingBacktrackingBit Manipulation+23 companies
- Count Days Without MeetingsmediumArraySorting3 companies
- Soup ServingsmediumMathDynamic ProgrammingProbability and Statistics3 companies
- The Latest Time to Catch a BusmediumArrayTwo PointersBinary SearchSorting3 companies
- Removing Stars From a StringmediumStringStackSimulation3 companies
- Cinema Seat AllocationmediumArrayHash TableGreedyBit Manipulation3 companies
- Count the Number of Infection SequenceshardArrayMathCombinatoricsFermat's Little Theorem3 companies
- Minimum Adjacent Swaps for K Consecutive OneshardArrayGreedySliding WindowPrefix Sum3 companies
- Minimum Common ValueeasyArrayHash TableTwo PointersBinary Search3 companies
- Minimum Time to Make Rope ColorfulmediumArrayStringDynamic ProgrammingGreedy3 companies
- Check If Two String Arrays are EquivalenteasyArrayString3 companies
- Minimum Interval to Include Each QueryhardArrayBinary SearchSweep LineSorting+13 companies
- Time Taken to Cross the DoorhardArrayQueueSimulation3 companies
- Flip String to Monotone IncreasingmediumStringDynamic Programming3 companies
- Replace Elements with Greatest Element on Right SideeasyArray3 companies
- Maximum Score After Splitting a StringeasyStringPrefix Sum3 companies
- Apple Redistribution into BoxeseasyArrayGreedySorting3 companies
- My Calendar IImediumArrayBinary SearchDesignSegment Tree+23 companies
- Stickers to Spell WordhardArrayHash TableStringDynamic Programming+43 companies
- Clumsy FactorialmediumMathStackSimulation3 companies
- Maximum Employees to Be Invited to a MeetinghardArrayDynamic ProgrammingDepth-First SearchGraph Theory+33 companies
- Minimum Deletions to Make Character Frequencies UniquemediumHash TableStringGreedySorting3 companies
- Minimum Operations to Make Array Equal to TargethardArrayDynamic ProgrammingStackGreedy+13 companies
- Optimal Partition of StringmediumHash TableStringGreedy3 companies
- Stone Game IVhardMathDynamic ProgrammingMinimaxGame Theory+33 companies
- Widest Vertical Area Between Two Points Containing No PointseasyArraySorting3 companies
- Count Number of Rectangles Containing Each PointmediumArrayHash TableBinary SearchBinary Indexed Tree+13 companies
- Number of Equivalent Domino PairseasyArrayHash TableCounting3 companies
- Largest Triangle AreaeasyArrayMathGeometryPolygons3 companies
- Minimum Absolute Difference in BSTeasyTreeDepth-First SearchBreadth-First SearchBinary Search Tree+13 companies
- Maximum Beauty of an Array After Applying OperationmediumArrayBinary SearchSliding WindowSorting3 companies
- Queue Reconstruction by HeightmediumArrayBinary Indexed TreeSegment TreeSorting3 companies
- Binary Searchable Numbers in an Unsorted ArraymediumArrayBinary SearchStackMonotonic Stack3 companies
- Least Number of Unique Integers after K RemovalsmediumArrayHash TableGreedySorting+13 companies
- Minimum Sensors to Cover GridmediumMath3 companies
- Sign of the Product of an ArrayeasyArrayMath3 companies
- Check if Grid can be Cut into SectionsmediumArraySorting3 companies
- Maximum Length of a Concatenated String with Unique CharactersmediumArrayStringBacktrackingBit Manipulation3 companies
- Count Number of Pairs With Absolute Difference KeasyArrayHash TableCounting3 companies
- Find the K-Sum of an ArrayhardArraySortingHeap (Priority Queue)3 companies
- Maximum Difference Between Node and AncestormediumTreeDepth-First SearchBinary Tree3 companies
- Minimum Number of Pushes to Type Word IImediumHash TableStringGreedySorting+13 companies
- Most Frequent Subtree SummediumHash TableTreeDepth-First SearchBinary Tree+13 companies
- Sales Analysis IIIeasyDatabase3 companies
- Shortest Path with Alternating ColorsmediumBreadth-First SearchGraph Theory3 companies
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.