refactor: refactor project structure

legacy/808 soupServings/C#/C#.sln

@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "soupServings", "soupServings.csproj", "{6D960F00-6A53-6E19-86A1-4BF3D1CD764F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6D960F00-6A53-6E19-86A1-4BF3D1CD764F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6D960F00-6A53-6E19-86A1-4BF3D1CD764F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6D960F00-6A53-6E19-86A1-4BF3D1CD764F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6D960F00-6A53-6E19-86A1-4BF3D1CD764F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {11CC27B7-C17E-4820-8A68-ADD32A2B37F8}
+	EndGlobalSection
+EndGlobal

legacy/808 soupServings/C#/Program.cs

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+using System;
+
+public class Solution
+{
+    private Dictionary<(int, int), double> dp = new Dictionary<(int, int), double>();
+    public double SoupServings(int n)
+    {
+        if (n > 5000)
+            return 1.0;
+
+        n = (n + 24) / 25;
+
+        // use dynamic programming
+        return Helper(n, n);
+    }
+
+    private double Helper(int a, int b)
+    {
+        if (a <= 0 && b <= 0)
+        {
+            return 0.5;
+        }
+        if (a <= 0)
+        {
+            return 1.0;
+        }
+        if (b <= 0)
+        {
+            return 0.0;
+        }
+        if (dp.ContainsKey((a, b)))
+        {
+            return dp[(a, b)];
+        }
+
+        double probability = 0.25 * (
+            Helper(a - 4, b) +
+            Helper(a - 3, b - 1) +
+            Helper(a - 2, b - 2) +
+            Helper(a - 1, b - 3)
+        );
+
+        dp[(a, b)] = probability;
+        return probability;
+    }
+}
+
+class Program
+{
+    static void Main()
+    {
+        var Solution = new Solution();
+        var ans = Solution.SoupServings(800);
+        Console.WriteLine(ans);
+    }
+}

legacy/808 soupServings/C#/soupServings.csproj

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