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
74 questions at DoorDash · all time
- 4SummediumArrayTwo PointersSortingfrequency 34.2
- Binary Tree Vertical Order TraversalmediumHash TableTreeDepth-First SearchBreadth-First Search+2frequency 34.2
- Count Sub IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 34.2
- Insert Delete GetRandom O(1)mediumArrayHash TableMathDesign+1frequency 34.2
- Integer to RomanmediumHash TableMathStringfrequency 34.2
- Jump GamemediumArrayDynamic ProgrammingGreedyfrequency 34.2
- LRU CachemediumHash TableLinked ListDesignDoubly-Linked Listfrequency 34.2
- Maximum Path Quality of a GraphhardArrayBacktrackingGraph Theoryfrequency 34.2
- Merge k Sorted ListshardLinked ListDivide and ConquerHeap (Priority Queue)Merge Sort+1frequency 34.2
- Similar String GroupshardArrayHash TableStringDepth-First Search+2frequency 34.2
- Sudoku SolverhardArrayHash TableBacktrackingMatrix+2frequency 34.2
- Swim in Rising WaterhardArrayBinary SearchDepth-First SearchBreadth-First Search+5frequency 34.2
- Add Two NumbersmediumLinked ListMathRecursionfrequency 27.3
- Brace ExpansionmediumStringBacktrackingStackBreadth-First Search+1frequency 27.3
- Design Add and Search Words Data StructuremediumStringDepth-First SearchDesignTriefrequency 27.3
- Design Browser HistorymediumArrayLinked ListStackDesign+2frequency 27.3
- Diameter of Binary TreeeasyTreeDepth-First SearchBinary TreeDP on Treesfrequency 27.3
- Find Edges in Shortest PathshardDepth-First SearchBreadth-First SearchGraph TheoryHeap (Priority Queue)+1frequency 27.3
- Jump Game IImediumArrayDynamic ProgrammingGreedyfrequency 27.3
- LFU CachehardHash TableLinked ListDesignDoubly-Linked Listfrequency 27.3
- Longest Palindromic SubstringmediumTwo PointersStringDynamic ProgrammingManacherfrequency 27.3
- Roman to IntegereasyHash TableMathStringfrequency 27.3
- Rotting OrangesmediumArrayBreadth-First SearchMatrixfrequency 27.3
- Shortest Path to Get FoodmediumArrayBreadth-First SearchMatrixfrequency 27.3
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.