1058.Minimize Rounding Error to Meet Target
MediumArrayGreedyMath45.9% acceptance1 companyPremium elsewhere, free hereVideo
Medium · 320 results
1073.Adding Two Negabinary Numbers
MediumArrayMath38.3% acceptance1 companyVideo
1093.Statistics from a Large Sample
MediumArrayMathProbability and Statistics43.6% acceptance1 companyVideo
1104.Path In Zigzag Labelled Binary Tree
MediumBinary TreeMathTree75.9% acceptance2 companiesVideo
1131.Maximum of Absolute Value Expression
MediumArrayMath49.0% acceptance2 companiesVideo
1140.Stone Game II
MediumArrayDynamic ProgrammingGame Theory75.8% acceptance5 companiesVideo
1201.Ugly Number III
MediumBinary SearchCombinatoricsMath31.9% acceptance3 companiesVideo
1215.Stepping Numbers
MediumBacktrackingBreadth-First SearchMath48.2% acceptance1 companyPremium elsewhere, free hereVideo
1227.Airplane Seat Assignment Probability
MediumBrainteaserDynamic ProgrammingMath67.3% acceptance2 companiesVideo
1230.Toss Strange Coins
MediumArrayDynamic ProgrammingMath58.1% acceptance1 companyPremium 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
1247.Minimum Swaps to Make Strings Equal
MediumGreedyMathString65.3% acceptance4 companiesVideo
1248.Count Number of Nice Subarrays
MediumArrayHash TableMath75.5% acceptance9 companiesVideo
1256.Encode Number
MediumBit ManipulationMathString70.0% acceptance1 companyPremium elsewhere, free hereVideo
1276.Number of Burgers with No Waste of Ingredients
MediumMath52.7% acceptanceVideo
1344.Angle Between Hands of a Clock
MediumMath69.6% acceptance10 companiesVideo
1352.Product of the Last K Numbers
MediumArrayData StreamDesign62.9% acceptance11 companiesVideo
1362.Closest Divisors
MediumMath64.3% acceptance1 companyVideo
1390.Four Divisors
MediumArrayMath56.6% acceptance6 companiesVideo
1401.Circle and Rectangle Overlapping
MediumGeometryMath67.4% acceptance2 companiesVideo
1414.Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
MediumGreedyMath64.9% acceptance1 companyVideo
1432.Max Difference You Can Get From Changing an Integer
MediumGreedyMath48.8% acceptance6 companiesVideo
1442.Count Triplets That Can Form Two Arrays of Equal XOR
MediumArrayBit ManipulationHash Table84.9% acceptance2 companiesVideo
1447.Simplified Fractions
MediumMathNumber TheoryString70.3% acceptance1 companyVideo
1492.The kth Factor of n
MediumMathNumber Theory70.8% acceptance7 companiesVideo
1513.Number of Substrings With Only 1s
MediumMathString57.4% acceptance3 companiesVideo
1524.Number of Sub-arrays With Odd Sum
MediumArrayDynamic ProgrammingMath55.7% acceptance6 companiesVideo
1538.Guess the Majority in a Hidden Array
MediumArrayInteractiveMath68.8% acceptance1 companyPremium elsewhere, free hereVideo
1551.Minimum Operations to Make Array Equal
MediumMath82.8% acceptance2 companiesVideo
1561.Maximum Number of Coins You Can Get
MediumArrayGame TheoryGreedy84.9% acceptance1 companyVideo
1573.Number of Ways to Split a String
MediumMathString34.6% acceptance1 companyVideo
1577.Number of Ways Where Square of Number Is Equal to Product of Two Numbers
MediumArrayHash TableMath43.9% acceptanceVideo
1621.Number of Sets of K Non-Overlapping Line Segments
MediumCombinatoricsDynamic ProgrammingMath69.3% acceptance1 companyVideo
1628.Design an Expression Tree With Evaluate Function
MediumArrayBinary TreeDesign82.4% acceptance1 companyPremium elsewhere, free hereVideo
1634.Add Two Polynomials Represented as Linked Lists
MediumLinked ListMathTwo Pointers61.1% acceptance1 companyPremium elsewhere, free hereVideo
1641.Count Sorted Vowel Strings
MediumCombinatoricsDynamic ProgrammingMath79.2% acceptance1 companyVideo
1648.Sell Diminishing-Valued Colored Balls
MediumArrayBinary SearchGreedy30.5% acceptance5 companiesVideo
1680.Concatenation of Consecutive Binary Numbers
MediumBit ManipulationMathSimulation66.6% acceptance3 companiesVideo
1685.Sum of Absolute Differences in a Sorted Array
MediumArrayMathPrefix Sum68.2% acceptance4 companiesVideo
1686.Stone Game VI
MediumArrayGame TheoryGreedy62.0% acceptanceVideo
1690.Stone Game VII
MediumArrayDynamic ProgrammingGame Theory59.4% acceptance2 companiesVideo
1753.Maximum Score From Removing Stones
MediumGreedyHeap (Priority Queue)Math68.6% acceptance1 companyVideo
1759.Count Number of Homogenous Substrings
MediumMathString57.6% acceptance2 companiesVideo
1780.Check if Number is a Sum of Powers of Three
MediumMath79.4% acceptance4 companiesVideo
1806.Minimum Number of Operations to Reinitialize a Permutation
MediumArrayMathSimulation72.9% acceptance1 companyVideo
1814.Count Nice Pairs in an Array
MediumArrayCountingHash Table48.6% acceptance6 companiesVideo
1823.Find the Winner of the Circular Game
MediumArrayMathQueue82.4% acceptance12 companiesVideo
1828.Queries on Number of Points Inside a Circle
MediumArrayGeometryMath86.9% acceptance2 companiesVideo
1860.Incremental Memory Leak
MediumMathSimulation73.0% acceptance1 companyVideo
Showing 101–150 of 320
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.