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darranhayesdarranhayes
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Add Kadanes max sub array sum
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6 files changed

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6 files changed

+119
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lines changed

‎kadanes-max-sub-array/MaxSubArray/Array.cs‎

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namespace MaxSubArray;
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public class Array
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{
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public static int MaxSubArraySum(int[] values)
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{
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if (values is null || values.Length == 0)
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return 0;
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int best = values[0];
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int sum = best;
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foreach (var x in values[1..])
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{
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sum = Math.Max(x, sum + x);
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best = Math.Max(best, sum);
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}
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return best;
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}
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}

‎kadanes-max-sub-array/MaxSubArray/MaxSubArray.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎kadanes-max-sub-array/MaxSubArrayTests/GlobalUsings.cs‎

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global using Xunit;

‎kadanes-max-sub-array/MaxSubArrayTests/MaxSubArraySumTests.cs‎

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namespace MaxSubArrayTests;
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public class MaxSubArraySumTests
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{
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[Fact]
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public void Empty() =>
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Assert.Equal(0, MaxSubArray.Array.MaxSubArraySum([]));
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[Fact]
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public void Single() =>
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Assert.Equal(3, MaxSubArray.Array.MaxSubArraySum([3]));
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[Theory]
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[InlineData(new int[] { -4, 10 }, 10)]
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[InlineData(new int[] { 10, -4 }, 10)]
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[InlineData(new int[] { -6, -4 }, -4)]
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[InlineData(new int[] { 4, 6 }, 10)]
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public void Double(int[] input, int expected) =>
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Assert.Equal(expected, MaxSubArray.Array.MaxSubArraySum(input));
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[Theory]
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[InlineData(new int[] { -1, 2, -5, 7 }, 7)]
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[InlineData(new int[] { -1, 2, -5, 2, 7 }, 9)]
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[InlineData(new int[] { -2, 1, -3, 4, -1, 2, 1, -5, 4 }, 6)]
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[InlineData(new int[] { -2, 4, -1, 2, 1, -5, 4, -9, 7, 8 }, 15)]
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public void NAry(int[] input, int expected) =>
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Assert.Equal(expected, MaxSubArray.Array.MaxSubArraySum(input));
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}

‎kadanes-max-sub-array/MaxSubArrayTests/MaxSubArrayTests.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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<IsTestProject>true</IsTestProject>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
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<PackageReference Include="xunit" Version="2.4.2" />
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<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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<PackageReference Include="coverlet.collector" Version="6.0.0">
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<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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</ItemGroup>
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<ItemGroup>
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<ProjectReference Include="..\MaxSubArray\MaxSubArray.csproj" />
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</ItemGroup>
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</Project>

‎kadanes-max-sub-array/kadanes-max-sub-array.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.8.34511.84
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MaxSubArray", "MaxSubArray\MaxSubArray.csproj", "{30B85A6A-FBC3-47D3-AD72-063D49F1D449}"
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MaxSubArrayTests", "MaxSubArrayTests\MaxSubArrayTests.csproj", "{A58D8ED0-84DF-4C7B-83E4-528782010E0A}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{30B85A6A-FBC3-47D3-AD72-063D49F1D449}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{30B85A6A-FBC3-47D3-AD72-063D49F1D449}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{30B85A6A-FBC3-47D3-AD72-063D49F1D449}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{30B85A6A-FBC3-47D3-AD72-063D49F1D449}.Release|Any CPU.Build.0 = Release|Any CPU
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{A58D8ED0-84DF-4C7B-83E4-528782010E0A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{A58D8ED0-84DF-4C7B-83E4-528782010E0A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{A58D8ED0-84DF-4C7B-83E4-528782010E0A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{A58D8ED0-84DF-4C7B-83E4-528782010E0A}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {755B3D90-E656-41A8-AF2D-DAEA8FF0CD65}
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EndGlobalSection
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EndGlobal

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