add csharp examples (#10)

04_quicksort/csharp/01_loop_sum/.gitignore

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+**/bin/*
+**/obj/*

04_quicksort/csharp/01_loop_sum/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/01_loop_sum.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

04_quicksort/csharp/01_loop_sum/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

04_quicksort/csharp/01_loop_sum/Program.cs

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+using System;
+using System.Collections.Generic;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine(Sum(new[] { 1, 2, 3, 4 }));
+        }
+
+        private static int Sum(IEnumerable<int> arr)
+        {
+            var total = 0;
+            foreach (var x in arr)
+            {
+                total += x;
+            }
+            return total;
+        }
+    }
+}

04_quicksort/csharp/01_loop_sum/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}

04_quicksort/csharp/02_recursive_sum/.gitignore

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+**/bin/*
+**/obj/*

04_quicksort/csharp/02_recursive_sum/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/02_recursive_sum.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

04_quicksort/csharp/02_recursive_sum/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

04_quicksort/csharp/02_recursive_sum/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine(Sum(new[] { 1, 2, 3, 4 }));
+        }
+
+        private static int Sum(IEnumerable<int> list)
+        {
+            if (!list.Any()) return 0;
+
+            return list.Take(1).First() + Sum(list.Skip(1));
+        }
+    }
+}

04_quicksort/csharp/02_recursive_sum/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}

04_quicksort/csharp/03_recursive_count/.gitignore

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+**/bin/*
+**/obj/*

04_quicksort/csharp/03_recursive_count/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/03_recursive_count.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

04_quicksort/csharp/03_recursive_count/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

04_quicksort/csharp/03_recursive_count/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine(Count(new[] { 1, 2, 3, 4 }));
+        }
+
+        private static int Count(IEnumerable<int> list)
+        {
+            if(!list.Any()) return 0;
+
+            return 1 + Count(list.Skip(1));
+        }
+    }
+}

04_quicksort/csharp/03_recursive_count/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}

04_quicksort/csharp/04_recursive_max/.gitignore

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+**/bin/*
+**/obj/*

04_quicksort/csharp/04_recursive_max/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/04_recursive_max.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

04_quicksort/csharp/04_recursive_max/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

04_quicksort/csharp/04_recursive_max/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine(Max(new[] { 1, 3, 2, 5, 9, 8 }));
+        }
+
+        private static int Max(IEnumerable<int> list)
+        {
+            if (!list.Any()) throw new ArgumentException(nameof(list));
+            if (list.Count() == 1) return list.First();
+            if (list.Count() == 2) return list.First() > list.Skip(1).Take(1).First() ? list.First() : list.Skip(1).Take(1).First();
+            var sub_max = Max(list.Skip(1));
+            return list.First() > sub_max ? list.First() : sub_max;
+        }
+    }
+}

04_quicksort/csharp/04_recursive_max/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}

04_quicksort/csharp/05_quicksort/.gitignore

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+**/bin/*
+**/obj/*

04_quicksort/csharp/05_quicksort/.vscode/launch.json

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+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceRoot}/bin/Debug/netcoreapp1.0/05_quicksort.dll",
+            "args": [],
+            "cwd": "${workspaceRoot}",
+            "externalConsole": false,
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart"
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command.pickProcess}"
+        }
+    ]
+}

04_quicksort/csharp/05_quicksort/.vscode/tasks.json

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+{
+    "version": "0.1.0",
+    "command": "dotnet",
+    "isShellCommand": true,
+    "args": [],
+    "tasks": [
+        {
+            "taskName": "build",
+            "args": [
+                "${workspaceRoot}/project.json"
+            ],
+            "isBuildCommand": true,
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

04_quicksort/csharp/05_quicksort/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var arr = new[] { 10, 5, 2, 3 };
+            Console.WriteLine(string.Join(", ", QuickSort(arr)));
+        }
+
+        private static IEnumerable<int> QuickSort(IEnumerable<int> list)
+        {
+            if (list.Count() <= 1) return list;
+            var pivot = list.First();
+            var less = list.Skip(1).Where(i => i <= pivot);
+            var greater = list.Skip(1).Where(i => i > pivot);
+            return QuickSort(less).Union(new List<int> { pivot }).Union(QuickSort(greater));
+        }
+    }
+}

04_quicksort/csharp/05_quicksort/project.json

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+{
+  "version": "1.0.0-*",
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {},
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.1"
+        }
+      },
+      "imports": "dnxcore50"
+    }
+  }
+}