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
- Remove Colored Pieces if Both Neighbors are the Same ColormediumMathStringGreedyGame Theory1 company
- Minimum FactorizationmediumMathGreedyPrime Factorization1 company
- Check if Every Row and Column Contains All NumberseasyArrayHash TableMatrix1 company
- Design Order Management SystemmediumHash TableDesign1 company
- Minimum Time to Eat All GrainshardArrayTwo PointersBinary SearchSorting1 company
- Best Position for a Service CentrehardArrayMathGeometryRandomized1 company
- Maximum Number of Subsequences After One InsertingmediumStringDynamic ProgrammingGreedyPrefix Sum1 company
- Minimum Costs Using the Train LinehardArrayDynamic Programming1 company
- Minimum Operations to Make Numbers Non-positivehardArrayBinary Search1 company
- Smallest Common RegionmediumArrayHash TableStringTree+41 company
- First Day Where You Have Been in All the RoomsmediumArrayDynamic Programming1 company
- Convert JSON String to Objecthard1 company
- Largest Merge Of Two StringsmediumTwo PointersStringGreedy1 company
- Least Operators to Express NumberhardMathDynamic ProgrammingMemoization1 company
- Ternary Expression ParsermediumStringStackRecursion1 company
- Three Equal PartshardArrayMath1 company
- Bitwise OR of Adjacent ElementseasyArrayBit Manipulation1 company
- Choose Numbers From Two Arrays in RangehardArrayDynamic Programming1 company
- Count Ways to Build Rooms in an Ant ColonyhardArrayMathDynamic ProgrammingTree+61 company
- Minimizing Array After Replacing Pairs With Their ProductmediumArrayDynamic ProgrammingGreedy1 company
- Minimum Moves to Equal Array Elements IIIeasyArrayMath1 company
- Preimage Size of Factorial Zeroes FunctionhardMathBinary Search1 company
- Pour WatermediumArraySimulation1 company
- Leetcodify Friends RecommendationshardDatabase1 company
- Leetcodify Similar FriendshardDatabase1 company
- Minimum Size Subarray in Infinite ArraymediumArrayHash TableSliding WindowPrefix Sum1 company
- Maximum Points After Collecting Coins From All NodeshardArrayDynamic ProgrammingBit ManipulationTree+31 company
- Maximum Points Tourist Can EarnmediumArrayDynamic ProgrammingMatrix1 company
- High-Access EmployeesmediumArrayHash TableStringSorting1 company
- Find Peak Calling Hours for Each CitymediumDatabase1 company
- Minimize Connected Groups by Inserting IntervalmediumArrayBinary SearchSliding WindowSorting1 company
- Minimum Runes to Add to Cast SpellhardArrayDepth-First SearchBreadth-First SearchGraph Theory+11 company
- Smallest Substring With Identical Characters IIhardStringBinary Search1 company
- Deep Merge of Two Objectsmedium1 company
- Minimize Result by Adding Parentheses to ExpressionmediumStringEnumeration1 company
- Making File Names UniquemediumArrayHash TableString1 company
- Number of Subarrays With AND Value of KhardArrayBinary SearchBit ManipulationSegment Tree1 company
- Removing Minimum Number of Magic BeansmediumArrayGreedySortingEnumeration+11 company
- Sum GamemediumMathStringGreedyGame Theory1 company
- Remove Adjacent Almost-Equal CharactersmediumStringDynamic ProgrammingGreedy1 company
- Count Lattice Points Inside a CirclemediumArrayHash TableMathGeometry+11 company
- Determine the Winner of a Bowling GameeasyArraySimulation1 company
- Find the Maximum Divisibility ScoreeasyArray1 company
- Maximum Deletions on a StringhardStringDynamic ProgrammingRolling HashString Matching+11 company
- Median of a Row Wise Sorted MatrixmediumArrayBinary SearchMatrix1 company
- Query Kth Smallest Trimmed NumbermediumArrayStringDivide and ConquerSorting+31 company
- Minimize Rounding Error to Meet TargetmediumArrayMathStringGreedy+11 company
- Minimum Number of Flips to Convert Binary Matrix to Zero MatrixhardArrayHash TableBit ManipulationBreadth-First Search+11 company
- Number of Ways to Build House of CardsmediumMathDynamic Programming1 company
- Strings Differ by One CharactermediumHash TableStringRolling HashHash Function1 company
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.