3524.Find X Value of Array I
MediumArrayDynamic ProgrammingMath66.5% acceptance1 companyVideo
With video · 642 results
3525.Find X Value of Array II
HardArrayMathSegment Tree70.4% acceptance1 companyVideo
3535.Unit Conversion II
MediumArrayBreadth-First SearchDepth-First Search61.5% acceptance1 companyPremium elsewhere, free hereVideo
3536.Maximum Product of Two Digits
EasyMathSorting75.7% acceptance1 companyVideo
3539.Find Sum of Array Product of Magical Sequences
HardArrayBit ManipulationBitmask61.9% acceptance2 companiesVideo
3549.Multiply Two Polynomials
HardArrayMath59.2% acceptancePremium elsewhere, free hereVideo
3550.Smallest Index With Digit Sum Equal to Index
EasyArrayMath84.6% acceptance1 companyVideo
3556.Sum of Largest Prime Substrings
MediumHash TableMathNumber Theory37.9% acceptance1 companyVideo
3558.Number of Ways to Assign Edge Weights I
MediumDepth-First SearchMathTree63.7% acceptance2 companiesVideo
3559.Number of Ways to Assign Edge Weights II
HardArrayBit ManipulationDepth-First Search71.8% acceptance3 companiesVideo
3560.Find Minimum Log Transportation Cost
EasyMath42.2% acceptanceVideo
3574.Maximize Subarray GCD Score
HardArrayEnumerationMath25.5% acceptance1 companyVideo
3577.Count the Number of Computer Unlocking Permutations
MediumArrayBrainteaserCombinatorics59.0% acceptance3 companiesVideo
3588.Find Maximum Area of a Triangle
MediumArrayEnumerationGeometry29.8% acceptance2 companiesVideo
3591.Check if Any Element Has Prime Frequency
EasyArrayCountingHash Table62.6% acceptanceVideo
3596.Minimum Cost Path with Alternating Directions I
MediumBrainteaserMath68.6% acceptancePremium elsewhere, free hereVideo
3602.Hexadecimal and Hexatrigesimal Conversion
EasyMathString79.4% acceptance1 companyVideo
3610.Minimum Number of Primes to Sum to Target
MediumArrayDynamic ProgrammingMath59.8% acceptance1 companyPremium elsewhere, free hereVideo
3618.Split Array by Prime Indices
MediumArrayMathNumber Theory49.3% acceptanceVideo
3622.Check Divisibility by Digit Sum and Product
EasyMath74.5% acceptanceVideo
3623.Count Number of Trapezoids I
MediumArrayGeometryHash Table48.1% acceptance3 companiesVideo
3625.Count Number of Trapezoids II
HardArrayGeometryHash Table40.0% acceptance2 companiesVideo
3627.Maximum Median Sum of Subsequences of Size 3
MediumArrayGame TheoryGreedy65.1% acceptance2 companiesVideo
3629.Minimum Jumps to Reach End via Prime Teleportation
MediumArrayBreadth-First SearchHash Table44.6% acceptance4 companiesVideo
3658.GCD of Odd and Even Sums
EasyMathNumber Theory89.8% acceptance3 companiesVideo
3663.Find The Least Frequent Digit
EasyArrayCountingHash Table68.8% acceptance1 companyVideo
3666.Minimum Operations to Equalize Binary String
HardBreadth-First SearchMathOrdered Set45.2% acceptance4 companiesVideo
3667.Sort Array By Absolute Value
EasyArrayMathSorting86.7% acceptance1 companyPremium elsewhere, free hereVideo
3669.Balanced K-Factor Decomposition
MediumBacktrackingMathNumber Theory40.2% acceptance2 companiesVideo
3697.Compute Decimal Representation
EasyArrayMath64.7% acceptance1 companyVideo
3700.Number of ZigZag Arrays II
HardDynamic ProgrammingMath67.7% acceptance3 companiesVideo
3704.Count No-Zero Pairs That Sum to N
HardDynamic ProgrammingMath15.6% acceptanceVideo
3723.Maximize Sum of Squares of Digits
MediumGreedyMath71.2% acceptance1 companyVideo
3726.Remove Zeros in Decimal Representation
EasyMathSimulation75.7% acceptanceVideo
3732.Maximum Product of Three Elements After One Replacement
MediumArrayGreedyMath47.8% acceptance2 companiesVideo
3736.Minimum Moves to Equal Array Elements III
EasyArrayMath81.0% acceptance1 companyVideo
3747.Count Distinct Integers After Removing Zeros
MediumDynamic ProgrammingMath23.1% acceptance1 companyVideo
3750.Minimum Number of Flips to Reverse Binary String
EasyBit ManipulationMathString75.5% acceptanceVideo
3751.Total Waviness of Numbers in Range I
MediumDynamic ProgrammingEnumerationMath86.9% acceptance2 companiesVideo
3753.Total Waviness of Numbers in Range II
HardDynamic ProgrammingMath56.2% acceptance4 companiesVideo
3754.Concatenate Non-Zero Digits and Multiply by Sum I
EasyMath66.2% acceptance3 companiesVideo
3756.Concatenate Non-Zero Digits and Multiply by Sum II
MediumMathPrefix SumString42.7% acceptance3 companiesVideo
3761.Minimum Absolute Distance Between Mirror Pairs
MediumArrayHash TableMath59.1% acceptance4 companiesVideo
3765.Complete Prime Number
MediumEnumerationMathNumber Theory36.2% acceptanceVideo
3770.Largest Prime from Consecutive Prime Sum
MediumArrayMathNumber Theory39.0% acceptance2 companiesVideo
3783.Mirror Distance of an Integer
EasyMath91.5% acceptance2 companiesVideo
3789.Minimum Cost to Acquire Required Items
MediumGreedyMath34.8% acceptanceVideo
3790.Smallest All-Ones Multiple
MediumHash TableMath46.8% acceptanceVideo
3805.Count Caesar Cipher Pairs
MediumArrayCountingHash Table50.7% acceptance1 companyVideo
3817.Good Indices in a Digit String
MediumMathString85.3% acceptancePremium elsewhere, free hereVideo
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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.