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
2,344 questions at Google · all time
- As Far from Land as PossiblemediumArrayDynamic ProgrammingBreadth-First SearchMatrixfrequency 5.0
- Average Value of Even Numbers That Are Divisible by ThreeeasyArrayMathfrequency 5.0
- Balanced K-Factor DecompositionmediumMathBacktrackingNumber Theoryfrequency 5.0
- Binary Prefix Divisible By 5easyArrayBit Manipulationfrequency 5.0
- Binary Tree PruningmediumTreeDepth-First SearchBinary Treefrequency 5.0
- Binary Tree Upside DownmediumTreeDepth-First SearchBinary Treefrequency 5.0
- Binary Trees With FactorsmediumArrayHash TableDynamic ProgrammingSortingfrequency 5.0
- Buy Two ChocolateseasyArrayGreedySortingfrequency 5.0
- Calculate Delayed Arrival TimeeasyMathfrequency 5.0
- Cells with Odd Values in a MatrixeasyArrayMathSimulationfrequency 5.0
- Change Data Typeeasyfrequency 5.0
- Check If Digits Are Equal in String After Operations IIhardMathStringCombinatoricsNumber Theoryfrequency 5.0
- Check if All Characters Have Equal Number of OccurrenceseasyHash TableStringCountingfrequency 5.0
- Check if Binary String Has at Most One Segment of OneseasyStringfrequency 5.0
- Check if There is a Valid Partition For The ArraymediumArrayDynamic Programmingfrequency 5.0
- Check if There is a Valid Path in a GridmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 5.0
- Chunk Arrayeasyfrequency 5.0
- Closest Node to Path in TreehardArrayTreeDepth-First SearchBreadth-First Searchfrequency 5.0
- Closest Prime Numbers in RangemediumMathNumber TheoryPrimality TestSieve Theory+1frequency 5.0
- Construct Product MatrixmediumArrayMatrixPrefix Sumfrequency 5.0
- Convert an Array Into a 2D Array With ConditionsmediumArrayHash Tablefrequency 5.0
- Convert to Base -2mediumMathfrequency 5.0
- Count All Valid Pickup and Delivery OptionshardMathDynamic ProgrammingCombinatoricsfrequency 5.0
- Count Beautiful NumbershardDynamic Programmingfrequency 5.0
- Count Different Palindromic SubsequenceshardStringDynamic Programmingfrequency 5.0
- Count Good MealsmediumArrayHash Tablefrequency 5.0
- Count Islands With Total Value Divisible by KmediumArrayDepth-First SearchBreadth-First SearchUnion-Find+1frequency 5.0
- Count K-th Roots in a RangemediumMathBinary Searchfrequency 5.0
- Count Nice Pairs in an ArraymediumArrayHash TableMathCountingfrequency 5.0
- Count Number of Rectangles Containing Each PointmediumArrayHash TableBinary SearchBinary Indexed Tree+1frequency 5.0
- Count Number of TeamsmediumArrayDynamic ProgrammingBinary Indexed TreeSegment Treefrequency 5.0
- Count Number of Ways to Place HousesmediumDynamic Programmingfrequency 5.0
- Count Pairs That Form a Complete Day IImediumArrayHash TableCountingfrequency 5.0
- Count Paths That Can Form a Palindrome in a TreehardHash TableBit ManipulationTreeDepth-First Searchfrequency 5.0
- Count Prefix and Suffix Pairs IeasyArrayStringTrieRolling Hash+2frequency 5.0
- Count Prime-Gap Balanced SubarraysmediumArrayMathQueueSliding Window+2frequency 5.0
- Count Residue PrefixeseasyHash TableStringfrequency 5.0
- Count Sequences to KhardArrayMathDynamic ProgrammingMemoization+1frequency 5.0
- Count Sorted Vowel StringsmediumMathDynamic ProgrammingCombinatoricsfrequency 5.0
- Count Stepping Numbers in RangehardStringDynamic Programmingfrequency 5.0
- Count Subarrays of Length Three With a ConditioneasyArrayfrequency 5.0
- Count Substrings Divisible By Last DigithardStringDynamic Programmingfrequency 5.0
- Count Substrings With K-Frequency Characters ImediumHash TableStringSliding Windowfrequency 5.0
- Count Triplets That Can Form Two Arrays of Equal XORmediumArrayHash TableMathBit Manipulation+1frequency 5.0
- Count Unhappy FriendsmediumArraySimulationfrequency 5.0
- Count Unreachable Pairs of Nodes in an Undirected GraphmediumDepth-First SearchBreadth-First SearchUnion-FindGraph Theoryfrequency 5.0
- Count Vowel Strings in RangesmediumArrayStringPrefix Sumfrequency 5.0
- Count of Substrings Containing Every Vowel and K Consonants ImediumHash TableStringSliding Windowfrequency 5.0
- Count the Number of Arrays with K Matching Adjacent ElementshardMathCombinatoricsFermat's Little Theoremfrequency 5.0
- Count the Number of InversionshardArrayDynamic Programmingfrequency 5.0
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.