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
- Maximum Difference Between Even and Odd Frequency IeasyHash TableStringCounting4 companies
- Maximum Non Negative Product in a MatrixmediumArrayDynamic ProgrammingMatrix4 companies
- Memoizemedium4 companies
- Minimize the Maximum Difference of PairsmediumArrayBinary SearchDynamic ProgrammingGreedy+14 companies
- Minimum Falling Path Sum IIhardArrayDynamic ProgrammingMatrix4 companies
- Minimum Moves to Make Array ComplementarymediumArrayHash TablePrefix Sum4 companies
- Minimum Time to Repair CarsmediumArrayBinary Search4 companies
- Prime Subtraction OperationmediumArrayMathBinary SearchGreedy+14 companies
- Reveal Cards In Increasing OrdermediumArrayQueueSortingSimulation4 companies
- Super PowmediumMathDivide and ConquerEuler's Totient FunctionEuler's Theorem4 companies
- Binary Tree PruningmediumTreeDepth-First SearchBinary Tree4 companies
- Sequential DigitsmediumEnumeration4 companies
- Design HashSeteasyArrayHash TableLinked ListDesign+14 companies
- Detect Cycles in 2D GridmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+14 companies
- Find Words Containing CharactereasyArrayString4 companies
- Lexicographically Smallest Equivalent StringmediumStringUnion-Find4 companies
- Longest Balanced Substring ImediumHash TableStringCountingEnumeration4 companies
- Maximum Number of Events That Can Be Attended IIhardArrayBinary SearchDynamic ProgrammingSorting4 companies
- Maximum Number of Tasks You Can AssignhardArrayTwo PointersBinary SearchGreedy+34 companies
- Maximum Value of an Ordered Triplet IImediumArrayPrefix Sum4 companies
- Smallest Even MultipleeasyMathNumber Theory4 companies
- Subtract the Product and Sum of Digits of an IntegereasyMath4 companies
- Super Ugly NumbermediumArrayMathDynamic Programming4 companies
- Transformed ArrayeasyArraySimulation4 companies
- Count Salary CategoriesmediumDatabase4 companies
- Find Users With Valid E-MailseasyDatabase4 companies
- Maximum Subarray Sum With Length Divisible by KmediumArrayHash TablePrefix Sum4 companies
- Minimum Operations to Convert All Elements to ZeromediumArrayHash TableStackGreedy+14 companies
- Minimum Operations to Make the Integer ZeromediumBit ManipulationBrainteaserEnumeration4 companies
- Minimum Score of a Path Between Two CitiesmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theory4 companies
- Minimum Total Distance TraveledhardArrayDynamic ProgrammingSorting4 companies
- Shortest Distance to a CharactereasyArrayTwo PointersString4 companies
- Total Waviness of Numbers in Range IIhardMathDynamic Programming4 companies
- Count Equal and Divisible Pairs in an ArrayeasyArray4 companies
- Minimum Number of Changes to Make Binary String BeautifulmediumString4 companies
- Find Followers CounteasyDatabase4 companies
- Largest Perimeter TriangleeasyArrayMathGreedySorting+24 companies
- Maximum Running Time of N ComputershardArrayBinary SearchGreedySorting4 companies
- N-Repeated Element in Size 2N ArrayeasyArrayHash TablePigeonhole Principle4 companies
- Count the Number of Complete ComponentsmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theory4 companies
- Find Right IntervalmediumArrayBinary SearchSorting4 companies
- Set Intersection Size At Least TwohardArrayGreedySorting4 companies
- Earliest Finish Time for Land and Water Rides IeasyArrayTwo PointersBinary SearchGreedy+14 companies
- Find Resultant Array After Removing AnagramseasyArrayHash TableStringSorting4 companies
- Process String with Special Operations IIhardStringSimulation4 companies
- Count Largest GroupeasyHash TableMathCounting4 companies
- Delete Characters to Make Fancy StringeasyString4 companies
- Find All Possible Stable Binary Arrays ImediumDynamic ProgrammingPrefix Sum4 companies
- Fruits Into Baskets IIImediumArrayBinary SearchSegment TreeOrdered Set4 companies
- Maximum Product of Two DigitseasyMathSorting4 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.