3506.Find Time Required to Eliminate Bacterial Strains
HardArrayGreedyHeap (Priority Queue)63.2% acceptancePremium elsewhere, free here
650 results
3512.Minimum Operations to Make Array Sum Divisible by K
EasyArrayMath92.4% acceptance4 companiesVideo
3513.Number of Unique XOR Triplets I
MediumArrayBit ManipulationMath57.2% acceptance1 companyVideo
3514.Number of Unique XOR Triplets II
MediumArrayBit ManipulationEnumeration52.9% acceptance1 companyVideo
3516.Find Closest Person
EasyMath88.9% acceptance4 companiesVideo
3518.Smallest Palindromic Rearrangement II
HardCombinatoricsCountingHash Table44.3% acceptanceVideo
3524.Find X Value of Array I
MediumArrayDynamic ProgrammingMath66.5% acceptance1 companyVideo
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
3749.Evaluate Valid Expressions
HardDivide and ConquerHash TableMath69.2% acceptancePremium elsewhere, free here
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
Showing 551–600 of 650
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.