1204.Last Person to Fit in the Bus
MediumDatabase70.2% acceptance6 companiesVideo
With video · 3,856 results
1205.Monthly Transactions II
MediumDatabase41.8% acceptance1 companyPremium elsewhere, free hereVideo
1206.Design Skiplist
HardDesignLinked List59.7% acceptance8 companiesVideo
1207.Unique Number of Occurrences
EasyArrayHash Table78.7% acceptance5 companiesVideo
1208.Get Equal Substrings Within Budget
MediumBinary SearchPrefix SumSliding Window60.2% acceptance4 companiesVideo
1209.Remove All Adjacent Duplicates in String II
MediumStackString61.7% acceptance18 companiesVideo
1210.Minimum Moves to Reach Target with Rotations
HardArrayBreadth-First SearchMatrix52.7% acceptance1 companyVideo
1211.Queries Quality and Percentage
EasyDatabase55.4% acceptance5 companiesVideo
1212.Team Scores in Football Tournament
MediumDatabase55.6% acceptance1 companyPremium elsewhere, free hereVideo
1213.Intersection of Three Sorted Arrays
EasyArrayBinary SearchCounting80.2% acceptance2 companiesPremium elsewhere, free hereVideo
1214.Two Sum BSTs
MediumBinary SearchBinary Search TreeBinary Tree68.2% acceptance1 companyPremium elsewhere, free hereVideo
1215.Stepping Numbers
MediumBacktrackingBreadth-First SearchMath48.2% acceptance1 companyPremium elsewhere, free hereVideo
1216.Valid Palindrome III
HardDynamic ProgrammingString49.2% acceptance3 companiesPremium elsewhere, free hereVideo
1217.Minimum Cost to Move Chips to The Same Position
EasyArrayGreedyMath72.8% acceptance5 companiesVideo
1218.Longest Arithmetic Subsequence of Given Difference
MediumArrayDynamic ProgrammingHash Table54.5% acceptance2 companiesVideo
1219.Path with Maximum Gold
MediumArrayBacktrackingMatrix68.6% acceptance5 companiesVideo
1220.Count Vowels Permutation
HardDynamic Programming61.7% acceptance1 companyVideo
1221.Split a String in Balanced Strings
EasyCountingGreedyString87.3% acceptance4 companiesVideo
1222.Queens That Can Attack the King
MediumArrayMatrixSimulation72.6% acceptance2 companiesVideo
1223.Dice Roll Simulation
HardArrayDynamic Programming51.4% acceptance2 companiesVideo
1224.Maximum Equal Frequency
HardArrayHash Table38.8% acceptance1 companyVideo
1225.Report Contiguous Dates
HardDatabase56.9% acceptance2 companiesPremium elsewhere, free hereVideo
1226.The Dining Philosophers
MediumConcurrency54.5% acceptance3 companiesVideo
1227.Airplane Seat Assignment Probability
MediumBrainteaserDynamic ProgrammingMath67.3% acceptance2 companiesVideo
1228.Missing Number In Arithmetic Progression
EasyArrayMath52.0% acceptance2 companiesPremium elsewhere, free hereVideo
1229.Meeting Scheduler
MediumArraySortingTwo Pointers55.3% acceptance11 companiesPremium elsewhere, free hereVideo
1230.Toss Strange Coins
MediumArrayDynamic ProgrammingMath58.1% acceptance1 companyPremium elsewhere, free hereVideo
1231.Divide Chocolate
HardArrayBinary Search60.5% acceptance1 companyPremium elsewhere, free hereVideo
1232.Check If It Is a Straight Line
EasyArrayGeometryMath40.1% acceptance3 companiesVideo
1233.Remove Sub-Folders from the Filesystem
MediumArrayDepth-First SearchString78.6% acceptance8 companiesVideo
1234.Replace the Substring for Balanced String
MediumSliding WindowString41.3% acceptance1 companyVideo
1235.Maximum Profit in Job Scheduling
HardArrayBinary SearchDynamic Programming54.8% acceptance22 companiesVideo
1236.Web Crawler
MediumBreadth-First SearchDepth-First SearchInteractive68.8% acceptance7 companiesPremium elsewhere, free hereVideo
1237.Find Positive Integer Solution for a Given Equation
MediumBinary SearchInteractiveMath70.3% acceptance2 companiesVideo
1238.Circular Permutation in Binary Representation
MediumBacktrackingBit ManipulationMath73.2% acceptance1 companyVideo
1239.Maximum Length of a Concatenated String with Unique Characters
MediumArrayBacktrackingBit Manipulation54.7% acceptance6 companiesVideo
1240.Tiling a Rectangle with the Fewest Squares
HardBacktracking55.0% acceptance3 companiesVideo
1241.Number of Comments per Post
EasyDatabase65.5% acceptance1 companyPremium elsewhere, free hereVideo
1243.Array Transformation
EasyArraySimulation53.6% acceptance1 companyPremium elsewhere, free hereVideo
1244.Design A Leaderboard
MediumDesignHash TableSorting67.9% acceptance9 companiesPremium elsewhere, free hereVideo
1245.Tree Diameter
MediumBreadth-First SearchDepth-First SearchGraph61.1% acceptance7 companiesPremium elsewhere, free hereVideo
1246.Palindrome Removal
HardArrayDynamic Programming46.4% acceptance1 companyPremium elsewhere, free hereVideo
1247.Minimum Swaps to Make Strings Equal
MediumGreedyMathString65.3% acceptance4 companiesVideo
1248.Count Number of Nice Subarrays
MediumArrayHash TableMath75.5% acceptance9 companiesVideo
1249.Minimum Remove to Make Valid Parentheses
MediumStackString71.3% acceptance11 companiesVideo
1250.Check If It Is a Good Array
HardArrayMathNumber Theory65.6% acceptance5 companiesVideo
1251.Average Selling Price
EasyDatabase38.0% acceptance6 companiesVideo
1252.Cells with Odd Values in a Matrix
EasyArrayMathSimulation79.7% acceptance2 companiesVideo
1253.Reconstruct a 2-Row Binary Matrix
MediumArrayGreedyMatrix49.4% acceptance1 companyVideo
1254.Number of Closed Islands
MediumArrayBreadth-First SearchDepth-First Search70.4% acceptance5 companiesVideo
Showing 1,201–1,250 of 3,856
How to use these solutions
Each solution breaks the problem into approaches, usually from brute force to the best one, and explains why each works. Code comes in Python, Java, C++ and other languages. Knowing why an approach works matters more in an interview than remembering the code.
- Try the problem first. Give it at least 20 minutes before you open the solution.
- Read every approach. The brute force shows you the problem; the faster ones show the pattern.
- Check the complexity. Note the time and space of each approach and what makes the difference.
- Write it yourself. Close the solution and code it from memory in the editor.
- Come back in a week. Solving it again later is what makes the pattern stick.