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
53 questions at Qualcomm · all time
- Reverse Nodes in k-GrouphardLinked ListRecursionfrequency 100.0
- String Compression IIImediumStringfrequency 97.2
- Maximum Number of OneshardMathGreedySortingHeap (Priority Queue)frequency 94.0
- Longest Substring Without Repeating CharactersmediumHash TableStringSliding Windowfrequency 90.5
- Number of IslandsmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 90.5
- Reverse Linked ListeasyLinked ListRecursionfrequency 90.5
- Two SumeasyArrayHash Tablefrequency 90.5
- LRU CachemediumHash TableLinked ListDesignDoubly-Linked Listfrequency 86.4
- Reverse StringeasyTwo PointersStringfrequency 81.5
- 3SummediumArrayTwo PointersSortingfrequency 75.6
- Linked List CycleeasyHash TableLinked ListTwo PointersFloyd's Cycle Finding Algorithmfrequency 75.6
- Majority ElementeasyArrayHash TableDivide and ConquerSorting+2frequency 75.6
- Move ZeroeseasyArrayTwo Pointersfrequency 75.6
- Palindrome NumbereasyMathfrequency 75.6
- Power of TwoeasyMathBit ManipulationRecursionfrequency 75.6
- Rectangle OverlapeasyMathGeometryfrequency 75.6
- Reverse BitseasyDivide and ConquerBit Manipulationfrequency 75.6
- Rotate ImagemediumArrayMathMatrixfrequency 75.6
- Trapping Rain WaterhardArrayTwo PointersDynamic ProgrammingStack+1frequency 75.6
- Valid ParentheseseasyStringStackBracket Sequencesfrequency 75.6
- Climbing StairseasyMathDynamic ProgrammingMemoizationfrequency 67.9
- Count Array Pairs Divisible by KhardArrayHash TableMathCounting+3frequency 67.9
- Count the Number of Fair PairsmediumArrayTwo PointersBinary SearchSortingfrequency 67.9
- Design Circular QueuemediumArrayLinked ListDesignQueuefrequency 67.9
- Implement Queue using StackseasyStackDesignQueuefrequency 67.9
- Remove Nth Node From End of ListmediumLinked ListTwo Pointersfrequency 67.9
- String to Integer (atoi)mediumStringfrequency 67.9
- Container With Most WatermediumArrayTwo PointersGreedyfrequency 57.2
- Counting BitseasyDynamic ProgrammingBit Manipulationfrequency 57.2
- Course Schedule IImediumDepth-First SearchBreadth-First SearchGraph TheoryTopological Sortfrequency 57.2
- Edit DistancemediumStringDynamic Programmingfrequency 57.2
- Find the Index of the First Occurrence in a StringeasyTwo PointersStringString MatchingZ Algorithm+2frequency 57.2
- Generate ParenthesesmediumStringDynamic ProgrammingBacktrackingBracket Sequencesfrequency 57.2
- Implement Stack using QueueseasyStackDesignQueuefrequency 57.2
- Is SubsequenceeasyTwo PointersStringDynamic Programmingfrequency 57.2
- Kth Largest Element in an ArraymediumArrayDivide and ConquerSortingHeap (Priority Queue)+1frequency 57.2
- Last Substring in Lexicographical OrderhardTwo PointersStringLyndon Factorizationfrequency 57.2
- Length of Last WordeasyStringfrequency 57.2
- Longest Common PrefixeasyArrayStringTriefrequency 57.2
- Maximum Depth of Binary TreeeasyTreeDepth-First SearchBreadth-First SearchBinary Treefrequency 57.2
- Maximum Product SubarraymediumArrayDynamic Programmingfrequency 57.2
- Median of Two Sorted ArrayshardArrayBinary SearchDivide and Conquerfrequency 57.2
- Merge Sorted ArrayeasyArrayTwo PointersSortingfrequency 57.2
- Merge Two Sorted ListseasyLinked ListRecursionfrequency 57.2
- Merge k Sorted ListshardLinked ListDivide and ConquerHeap (Priority Queue)Merge Sort+1frequency 57.2
- Middle of the Linked ListeasyLinked ListTwo Pointersfrequency 57.2
- Moving Average from Data StreameasyArrayDesignQueueData Streamfrequency 57.2
- Number of 1 BitseasyDivide and ConquerBit Manipulationfrequency 57.2
- Peak Index in a Mountain ArraymediumArrayBinary SearchTernary Searchfrequency 57.2
- PermutationsmediumArrayBacktrackingfrequency 57.2
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.