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
- Binary Trees With FactorsmediumArrayHash TableDynamic ProgrammingSorting2 companies
- Buy Two ChocolateseasyArrayGreedySorting2 companies
- Count Beautiful NumbershardDynamic Programming2 companies
- Count K-th Roots in a RangemediumMathBinary Search2 companies
- Count Triplets That Can Form Two Arrays of Equal XORmediumArrayHash TableMathBit Manipulation+12 companies
- Distinct Prime Factors of Product of ArraymediumArrayHash TableMathNumber Theory+62 companies
- Find Mirror Score of a StringmediumHash TableStringStackSimulation2 companies
- Find Valid Pair of Adjacent Digits in StringeasyHash TableStringCounting2 companies
- Find the Kth Largest Integer in the ArraymediumArrayStringDivide and ConquerSorting+22 companies
- Find the Largest Palindrome Divisible by KhardMathStringDynamic ProgrammingGreedy+12 companies
- Largest Element in an Array after Merge OperationsmediumArrayGreedy2 companies
- Lexicographically Smallest PalindromeeasyTwo PointersStringGreedy2 companies
- Longest Palindrome After Substring Concatenation ImediumTwo PointersStringDynamic ProgrammingEnumeration2 companies
- Maximize Sum of Device Ratingsmedium2 companies
- Maximum Product of Three Elements After One ReplacementmediumArrayMathGreedySorting2 companies
- Minimum Addition to Make Integer BeautifulmediumMathGreedy2 companies
- Minimum Distance Between Three Equal Elements IeasyArrayHash Table2 companies
- Minimum Division Operations to Make Array Non DecreasingmediumArrayMathGreedyNumber Theory2 companies
- Minimum Moves to Reach Target ScoremediumMathGreedy2 companies
- Number of Changing KeyseasyString2 companies
- Reshape Data: Pivoteasy2 companies
- Sum of Perfect Square AncestorshardArrayHash TableMathTree+32 companies
- Total Distance TraveledeasyMathSimulation2 companies
- Abbreviating the Product of a RangehardMathNumber Theory1 company
- Count Common Words With One OccurrenceeasyArrayHash TableStringCounting1 company
- Count Non Decreasing Arrays With Given Digit SumshardArrayDynamic ProgrammingPrefix Sum1 company
- Count Strictly Increasing SubarraysmediumArrayMathDynamic Programming1 company
- Create a Session Bar CharteasyDatabase1 company
- Design a File Sharing SystemmediumHash TableDesignSortingHeap (Priority Queue)+11 company
- Detect Pattern of Length M Repeated K or More TimeseasyArrayEnumeration1 company
- Evaluate Boolean ExpressionmediumDatabase1 company
- Find Palindrome With Fixed LengthmediumArrayMath1 company
- K-th Smallest Prime FractionmediumArrayTwo PointersBinary SearchSorting+11 company
- Maximize Score After Pair DeletionsmediumArrayGreedy1 company
- Maximum Points After Enemy BattlesmediumArrayGreedy1 company
- Minimum Number of Steps to Make Two Strings Anagram IImediumHash TableStringCounting1 company
- Number of Ways to Buy Pens and PencilsmediumMathEnumeration1 company
- Toss Strange CoinsmediumArrayMathDynamic ProgrammingProbability and Statistics1 company
- Weather Type in Each CountryeasyDatabase1 company
- Add Edges to Make Degrees of All Nodes EvenhardHash TableGraph Theory1 company
- Maximum Total Importance of RoadsmediumGreedyGraph TheorySortingHeap (Priority Queue)1 company
- Counting ElementseasyArrayHash Table1 company
- Minimum Time to Make Array Sum At Most xhardArrayDynamic ProgrammingSorting1 company
- Cycle Length Queries in a TreehardArrayTreeBinary TreeBinary Lifting+11 company
- Maximum Number of OneshardMathGreedySortingHeap (Priority Queue)1 company
- Count Student Number in DepartmentsmediumDatabase1 company
- Minimum Elements to Add to Form a Given SummediumArrayGreedy1 company
- Rectangles AreamediumDatabase1 company
- Grid IlluminationhardArrayHash Table1 company
- Number of Valid Words for Each PuzzlehardArrayHash TableStringBit Manipulation+11 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.