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ortools/linear_solver/samples/SimpleLpProgramMb.cs

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+// Copyright 2010-2022 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.
+
+// Minimal example to call the GLOP solver.
+// [START program]
+// [START import]
+using System;
+using Google.OrTools.ModelBuilder;
+// [END import]
+
+public class SimpleLpProgramMb
+{
+    static void Main()
+    {
+        // [START model]
+        // Create the model builder.
+        ModelBuilder model = new ModelBuilder();
+        // [END model]
+
+        // [START variables]
+        // Create the variables x and y.
+        Variable x = model.NewNumVar(0.0, double.PositiveInfinity, "x");
+        Variable y = model.NewNumVar(0.0, double.PositiveInfinity, "y");
+
+        Console.WriteLine("Number of variables = " + model.VariablesCount());
+        // [END variables]
+
+        // [START constraints]
+        // x + 7 * y <= 17.5.
+        model.Add(x + 7 * y <= 17.5);
+
+        // x <= 3.5.
+        model.Add(x <= 3.5);
+
+        Console.WriteLine("Number of constraints = " + model.ConstraintsCount());
+        // [END constraints]
+
+        // [START objective]
+        // Maximize x + 10 * y.
+        model.Maximize(x + 10 * y);
+        // [END objective]
+
+        // [START solver]
+        // Create the model solver with the GLOP backend.
+        ModelSolver solver = new ModelSolver("GLOP");
+        if (!solver.SolverIsSupported())
+        {
+            return;
+        }
+        // [END solver]
+
+        // [START solve]
+        var resultStatus = solver.Solve(model);
+        // [END solve]
+
+        // [START print_solution]
+        // Check that the problem has an optimal solution.
+        if (resultStatus != SolveStatus.OPTIMAL)
+        {
+            Console.WriteLine("The problem does not have an optimal solution!");
+            return;
+        }
+        Console.WriteLine("Solution:");
+        Console.WriteLine("Objective value = " + solver.ObjectiveValue);
+        Console.WriteLine("x = " + solver.Value(x));
+        Console.WriteLine("y = " + solver.Value(y));
+        // [END print_solution]
+
+        // [START advanced]
+        Console.WriteLine("\nAdvanced usage:");
+        Console.WriteLine("Problem solved in " + solver.WallTime + " milliseconds");
+        // [END advanced]
+    }
+}
+// [END program]