Package samples.real

Source Code of samples.real.SantaClaude

/*
* Copyright (c) 1999-2014, Ecole des Mines de Nantes
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the Ecole des Mines de Nantes nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package samples.real;

import org.slf4j.LoggerFactory;
import samples.AbstractProblem;
import solver.Solver;
import solver.constraints.IntConstraintFactory;
import solver.constraints.real.RealConstraint;
import solver.search.loop.monitors.IMonitorSolution;
import solver.search.strategy.IntStrategyFactory;
import solver.variables.IntVar;
import solver.variables.RealVar;
import solver.variables.VariableFactory;
import util.tools.ArrayUtils;

import java.util.Random;

/**
* <br/>
*
* @author Charles Prud'homme
* @since 20/07/12
*/
public class SantaClaude extends AbstractProblem {

    int n_gifts = 20;
    int n_kids = 10;
    int max_price = 25;
    int[] gift_price;

    IntVar[] kid_gift;
    IntVar[] kid_price;
    IntVar total_cost;
    RealVar average;

  @Override
    public void createSolver() {
        solver = new Solver("Santa Claude");
    }

    @Override
    public void buildModel() {
        Random rand = new Random(29091981);
        double precision = 1.e-6;

        kid_gift = VariableFactory.enumeratedArray("g2k", n_kids, 0, n_gifts, solver);
        kid_price = VariableFactory.enumeratedArray("p2k", n_kids, 0, max_price, solver);
        total_cost = VariableFactory.bounded("total cost", 0, max_price * n_kids, solver);
        average = VariableFactory.real("average", 0, max_price * n_kids, precision, solver);


        gift_price = new int[n_gifts];
        for (int i = 0; i < n_gifts; i++) {
            gift_price[i] = rand.nextInt(max_price) + 1;
        }
        solver.post(IntConstraintFactory.alldifferent(kid_gift, "BC"));
        for (int i = 0; i < n_kids; i++) {
            solver.post(IntConstraintFactory.element(kid_price[i], gift_price, kid_gift[i], 0, "detect"));
        }
        solver.post(IntConstraintFactory.sum(kid_price, total_cost));

        StringBuilder funBuilder = new StringBuilder("(");
        for (int i = 0; i < n_kids; i++) {
      funBuilder.append("+{").append(i).append('}');
        }
    funBuilder.append(")/").append(n_kids).append("=").append('{').append(n_kids).append('}');

        RealVar[] all_vars = ArrayUtils.append(VariableFactory.real(kid_price, precision), new RealVar[]{average});
    String function = funBuilder.toString();

        solver.post(new RealConstraint(function, all_vars));
    }

    @Override
    public void configureSearch() {
        solver.set(IntStrategyFactory.random_value(kid_gift, 29091981));
    }

    @Override
    public void solve() {
        solver.plugMonitor(new IMonitorSolution() {
            @Override
            public void onSolution() {
                if (LoggerFactory.getLogger("solver").isInfoEnabled()) {
                    LoggerFactory.getLogger("solver").info("*******************");
                    for (int i = 0; i < n_kids; i++) {
                        LoggerFactory.getLogger("solver").info("Kids #{} has received the gift #{} at a cost of {} euros",
                                new Object[]{i, kid_gift[i].getValue(), kid_price[i].getValue()});
                    }
                    LoggerFactory.getLogger("solver").info("Total cost: {} euros", total_cost.getValue());
                    LoggerFactory.getLogger("solver").info("Average: [{},{}] euros", average.getLB(), average.getUB());
                }
            }
        });
        solver.findAllSolutions();
    }

    @Override
    public void prettyOut() {
    solver.getIbex().release();
    }

    public static void main(String[] args) {
        new SantaClaude().execute(args);
    }
}
TOP

Related Classes of samples.real.SantaClaude

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.