add missing example

ortools/linear_solver/samples/MipVarArray.cs

@@ -0,0 +1,106 @@
+// Copyright 2010-2018 Google LLC
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// [START program]
+// [START import]
+using System;
+using Google.OrTools.LinearSolver;
+// [END import]
+
+public class MipVarArray
+{
+  class DataModel {
+    public double[,] ConstraintCoeffs = {
+      {5, 7, 9, 2, 1},
+      {18, 4, -9, 10, 12},
+      {4, 7, 3, 8, 5},
+      {5, 13, 16, 3, -7},
+    };
+    public double[] Bounds{250, 285, 211, 315};
+    public double[] ObjCoeffs{ 7, 8, 2, 9, 6};
+    public int NumVars = 5;
+    public int NumConstraints = 4;
+  }
+
+  public static void Main()
+  {
+    // [START data]
+    DataModel data = new DataModel();
+    // [END data]
+
+    // [START solver]
+    // Create the linear solver with the CBC backend.
+    Solver solver = Solver.CreateSolver("SimpleMipProgram", "CBC_MIXED_INTEGER_PROGRAMMING");
+    // [END solver]
+
+    // [START variables]
+    MPVariable[] x = new MPVariable[data.NumVars];
+    for (int j = 0; j < data.NumVars; j++) {
+      x[j] = MakeIntVar(0.0, double.PositiveInfinity, "x");
+    }
+    Console.WriteLine("Number of variables = " + solver.NumVariables());
+    // [END variables]
+
+    // [START constraints]
+    for (int i = 0; i < data.NumConstraints; ++i) {
+      MPConstraint constraint = solver.MakeConstraint(0, data.Bounds[i], "");
+      for (int j = 0; j < data.NumVars; ++j) {
+        constraint.SetCoefficient(x[j], data.ConstraintCoeffs[i][j]);
+      }
+    }
+    Console.WriteLine("Number of constraints = " + solver.NumConstraints());
+    // [END constraints]
+
+    // [START objective]
+    objective = solver.Objective()
+    for (int j = 0; j < data.NumVars; ++j) {
+      objective.SetCoefficient(x[j], data.ObjCoeffs[j])
+    objective.SetMaximization()
+    // [END objective]
+
+    // [START solve]
+    Solver.ResultStatus resultStatus = solver.Solve();
+    // Check that the problem has an optimal solution.
+    if (resultStatus != Solver.ResultStatus.OPTIMAL)
+    {
+      Console.WriteLine("The problem does not have an optimal solution!");
+      return;
+    }
+    // [END solve]
+
+    // [START print_solution]
+    Console.WriteLine("Solution:");
+    Console.WriteLine("Objective value = " + solver.Objective().Value());
+    const MPSolver::ResultStatus result_status = solver.Solve();
+    // Check that the problem has an optimal solution.
+    if (result_status != MPSolver::OPTIMAL) {
+      Console.WriteLine("The problem does not have an optimal solution.");
+    }
+
+    Console.WriteLine("Solution:");
+    Console.WriteLine("Optimal objective value = " + solver.Objective().Value());
+
+    for (int j = 0; j < data.num_vars; ++j) {
+      Console.WriteLine("x[" + j + "] = " + x[j].SolutionValue());
+    }
+    // [END print_solution]
+
+    // [START advanced]
+    Console.WriteLine("\nAdvanced usage:");
+    Console.WriteLine("Problem solved in " + solver.WallTime() + " milliseconds");
+    Console.WriteLine("Problem solved in " + solver.Iterations() + " iterations");
+    Console.WriteLine("Problem solved in " + solver.Nodes() + " branch-and-bound nodes");
+    // [END advanced]
+  }
+}
+// [END program]

ortools/linear_solver/samples/MipVarArray.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <LangVersion>7.2</LangVersion>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <EnableDefaultItems>false</EnableDefaultItems>
+    <RestoreSources>../../../packages;$(RestoreSources);https://api.nuget.org/v3/index.json</RestoreSources>
+  </PropertyGroup>
+
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <GenerateTailCalls>true</GenerateTailCalls>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="MipVarArray.cs" />
+    <PackageReference Include="Google.OrTools" Version="7.1.*" />
+  </ItemGroup>
+</Project>