143 lines
3.8 KiB
C#
143 lines
3.8 KiB
C#
// Copyright 2010-2017 Google
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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using System;
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using Google.OrTools.Sat;
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public class VarArraySolutionPrinter : CpSolverSolutionCallback
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{
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public VarArraySolutionPrinter(IntVar[] variables)
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{
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variables_ = variables;
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}
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public override void OnSolutionCallback()
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{
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{
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Console.WriteLine(String.Format("Solution #{0}: time = {1:F2} s",
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solution_count_, WallTime()));
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foreach (IntVar v in variables_)
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{
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Console.WriteLine(
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String.Format(" {0} = {1}", v.ShortString(), Value(v)));
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}
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solution_count_++;
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}
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}
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public int SolutionCount()
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{
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return solution_count_;
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}
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private int solution_count_;
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private IntVar[] variables_;
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}
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public class CodeSamplesSat
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{
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static void CodeSample()
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{
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// Creates the model.
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CpModel model = new CpModel();
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// Creates the Boolean variable.
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IntVar x = model.NewBoolVar("x");
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}
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static void MinimalCpSat()
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{
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// Creates the model.
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CpModel model = new CpModel();
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// Creates the variables.
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int num_vals = 3;
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IntVar x = model.NewIntVar(0, num_vals - 1, "x");
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IntVar y = model.NewIntVar(0, num_vals - 1, "y");
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IntVar z = model.NewIntVar(0, num_vals - 1, "z");
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// Creates the constraints.
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model.Add(x != y);
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// Creates a solver and solves the model.
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CpSolver solver = new CpSolver();
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CpSolverStatus status = solver.Solve(model);
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if (status == CpSolverStatus.ModelSat)
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{
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Console.WriteLine("x = " + solver.Value(x));
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Console.WriteLine("y = " + solver.Value(y));
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Console.WriteLine("z = " + solver.Value(z));
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}
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}
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static void MinimalCpSatWithTimeLimit()
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{
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// Creates the model.
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CpModel model = new CpModel();
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// Creates the variables.
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int num_vals = 3;
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IntVar x = model.NewIntVar(0, num_vals - 1, "x");
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IntVar y = model.NewIntVar(0, num_vals - 1, "y");
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IntVar z = model.NewIntVar(0, num_vals - 1, "z");
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// Creates the constraints.
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model.Add(x != y);
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// Creates a solver and solves the model.
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CpSolver solver = new CpSolver();
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// Adds a time limit. Parameters are stored as strings in the solver.
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solver.StringParameters = "max_time_in_seconds:10.0" ;
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CpSolverStatus status = solver.Solve(model);
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if (status == CpSolverStatus.ModelSat)
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{
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Console.WriteLine("x = " + solver.Value(x));
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Console.WriteLine("y = " + solver.Value(y));
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Console.WriteLine("z = " + solver.Value(z));
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}
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}
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static void MinimalCpSatAllSolutions()
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{
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// Creates the model.
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CpModel model = new CpModel();
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// Creates the variables.
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int num_vals = 3;
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IntVar x = model.NewIntVar(0, num_vals - 1, "x");
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IntVar y = model.NewIntVar(0, num_vals - 1, "y");
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IntVar z = model.NewIntVar(0, num_vals - 1, "z");
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// Creates the constraints.
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model.Add(x != y);
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// Creates a solver and solves the model.
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CpSolver solver = new CpSolver();
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VarArraySolutionPrinter cb =
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new VarArraySolutionPrinter(new IntVar[] {x, y, z});
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solver.SearchAllSolutions(model, cb);
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Console.WriteLine(String.Format("Number of solutions found: {0}",
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cb.SolutionCount()));
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}
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static void Main()
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{
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CodeSample();
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MinimalCpSat();
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MinimalCpSatWithTimeLimit();
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MinimalCpSatAllSolutions();
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}
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}
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