SolveAndPrintIntermediateSolutionsSampleSat.cs

// Copyright 2010-2024 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]
using System;
using Google.OrTools.Sat;

// [START print_solution]
public class VarArraySolutionPrinterWithObjective : CpSolverSolutionCallback
{
    public VarArraySolutionPrinterWithObjective(IntVar[] variables)
    {
        variables_ = variables;
    }

    public override void OnSolutionCallback()
    {
        Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s", solution_count_, WallTime()));
        Console.WriteLine(String.Format("  objective value = {0}", ObjectiveValue()));
        foreach (IntVar v in variables_)
        {
            Console.WriteLine(String.Format("  {0} = {1}", v.ToString(), Value(v)));
        }
        solution_count_++;
    }

    public int SolutionCount()
    {
        return solution_count_;
    }

    private int solution_count_;
    private IntVar[] variables_;
}
// [END print_solution]

public class SolveAndPrintIntermediateSolutionsSampleSat
{
    static void Main()
    {
        // Creates the model.
        // [START model]
        CpModel model = new CpModel();
        // [END model]

        // Creates the variables.
        // [START variables]
        int num_vals = 3;

        IntVar x = model.NewIntVar(0, num_vals - 1, "x");
        IntVar y = model.NewIntVar(0, num_vals - 1, "y");
        IntVar z = model.NewIntVar(0, num_vals - 1, "z");
        // [END variables]

        // Adds a different constraint.
        // [START constraints]
        model.Add(x != y);
        // [END constraints]

        // Maximizes a linear combination of variables.
        // [START objective]
        model.Maximize(x + 2 * y + 3 * z);
        // [END objective]

        // Creates a solver and solves the model.
        // [START solve]
        CpSolver solver = new CpSolver();
        VarArraySolutionPrinterWithObjective cb = new VarArraySolutionPrinterWithObjective(new IntVar[] { x, y, z });
        solver.Solve(model, cb);
        // [END solve]

        Console.WriteLine(String.Format("Number of solutions found: {0}", cb.SolutionCount()));
    }
}
// [END program]