Problems
Callback's own problems and the LeetCode questions companies have been asking, in one place — pick a category, then filter by company, frequency, status, difficulty, topic, and language.
Asked on LeetCode
3,115 questions · all time
- K Divisible Elements SubarraysmediumArrayHash TableTrieRolling Hash+22 companies
- Maximum XOR for Each QuerymediumArrayBit ManipulationPrefix Sum2 companies
- Most Frequent IDsmediumArrayHash TableHeap (Priority Queue)Ordered Set2 companies
- Maximum Coins From K Consecutive BagsmediumArrayBinary SearchGreedySliding Window+22 companies
- Make Array Zero by Subtracting Equal AmountseasyArrayHash TableGreedySorting+22 companies
- Design Ride Sharing SystemmediumHash TableDesignQueueData Stream2 companies
- Maximize Score of Numbers in RangesmediumArrayBinary SearchGreedySorting2 companies
- Transform to ChessboardhardArrayMathBit ManipulationMatrix2 companies
- Minimum Cost Homecoming of a Robot in a GridmediumArrayGreedy2 companies
- Implement Magic DictionarymediumHash TableStringDepth-First SearchDesign+12 companies
- Count Sequences to KhardArrayMathDynamic ProgrammingMemoization+12 companies
- Two Sum III - Data structure designeasyArrayHash TableTwo PointersDesign+12 companies
- Minimum Time to Complete All DeliveriesmediumMathBinary Search2 companies
- Determine if Two Events Have ConflicteasyArrayString2 companies
- Minimum Number of Chairs in a Waiting RoomeasyStringSimulation2 companies
- Print Zero Even OddmediumConcurrency2 companies
- Find All Lonely Numbers in the ArraymediumArrayHash TableCounting2 companies
- Maximum Profit From Trading StocksmediumArrayDynamic Programming2 companies
- Swap Adjacent in LR StringmediumTwo PointersString2 companies
- Paint House IIhardArrayDynamic Programming2 companies
- Basic Calculator IVhardHash TableMathStringStack+12 companies
- Find Maximum Removals From Source StringmediumArrayHash TableTwo PointersString+12 companies
- Find the Shortest SuperstringhardArrayStringDynamic ProgrammingBit Manipulation+22 companies
- Maximum Number of Removable CharactersmediumArrayTwo PointersStringBinary Search2 companies
- Number of Lines To Write StringeasyArrayString2 companies
- Number of Ways to Select BuildingsmediumStringDynamic ProgrammingPrefix Sum2 companies
- Previous Permutation With One SwapmediumArrayGreedy2 companies
- Cutting RibbonsmediumArrayBinary Search2 companies
- Lexicographically Smallest Beautiful StringhardStringGreedy2 companies
- Odd Even JumphardArrayDynamic ProgrammingStackSorting+22 companies
- Print in OrdereasyConcurrency2 companies
- Count Zero Request ServersmediumArrayHash TableSliding WindowSorting2 companies
- Shortest Path to Get FoodmediumArrayBreadth-First SearchMatrix2 companies
- Find And Replace in StringmediumArrayHash TableStringSorting2 companies
- Deepest Leaves SummediumTreeDepth-First SearchBreadth-First SearchBinary Tree2 companies
- Strobogrammatic Number IImediumArrayStringRecursion2 companies
- Digit Operations to Make Two Integers EqualmediumMathGraph TheoryHeap (Priority Queue)Number Theory+12 companies
- Minimum Flips to Make a OR b Equal to cmediumBit Manipulation2 companies
- Valid Tic-Tac-Toe StatemediumArrayMatrix2 companies
- Inverse Coin ChangemediumArrayDynamic Programming2 companies
- Sequence ReconstructionmediumArrayGraph TheoryTopological SortDirected Acyclic Graph2 companies
- Binary Search Tree to Greater Sum TreemediumTreeDepth-First SearchBinary Search TreeBinary Tree2 companies
- Count Bowl SubarraysmediumArrayStackMonotonic Stack2 companies
- 4 Keys KeyboardmediumMathDynamic Programming2 companies
- Check if All the Integers in a Range Are CoveredeasyArrayHash TablePrefix Sum2 companies
- Contain VirushardArrayDepth-First SearchBreadth-First SearchMatrix+12 companies
- Maximum Number of Accepted InvitationsmediumArrayDepth-First SearchGraph TheoryMatrix+92 companies
- Truncate SentenceeasyArrayString2 companies
- Best Poker HandeasyArrayHash TableCounting2 companies
- Largest Palindromic NumbermediumHash TableStringGreedyCounting2 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.