org.chocosolver.samples.set.SetUnion Maven / Gradle / Ivy

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/**
 * Copyright (c) 2015, Ecole des Mines de Nantes
 * All rights reserved.
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 *    This product includes software developed by the .
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 *    derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY  ''AS IS'' AND ANY
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/**
 * Created by IntelliJ IDEA.
 * User: Jean-Guillaume Fages
 * Date: 14/01/13
 * Time: 18:25
 */

package org.chocosolver.samples.set;

import org.chocosolver.samples.AbstractProblem;
import org.chocosolver.solver.Solver;
import org.chocosolver.solver.constraints.set.SetConstraintsFactory;
import org.chocosolver.solver.search.strategy.SetStrategyFactory;
import org.chocosolver.solver.variables.SetVar;
import org.chocosolver.solver.variables.VariableFactory;

/**
 * Small problem to illustrate how to use set variables
 * enumerates sets such that z = union(x,y)
 *
 * @author Jean-Guillaume Fages
 */
public class SetUnion extends AbstractProblem {

    private SetVar x, y, z;
    private boolean noEmptySet = true;

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

    @Override
    public void createSolver() {
        solver = new Solver("set union sample");
    }

    @Override
    public void buildModel() {
        // x initial domain
		x = VariableFactory.set("x",new int[]{1,-2,3},new int[]{1},solver);
        // y initial domain
		y = VariableFactory.set("y",new int[]{-6,-2,7},solver);
        // z initial domain
		z = VariableFactory.set("z",-2,7,solver);
        // set-union constraint
		solver.post(SetConstraintsFactory.union(new SetVar[]{x, y}, z));
        if (noEmptySet) {
            solver.post(SetConstraintsFactory.nbEmpty(new SetVar[]{x, y, z}, VariableFactory.fixed(0, solver)));
        }
    }

    @Override
    public void configureSearch() {
        solver.set(SetStrategyFactory.remove_first(new SetVar[]{x, y, z}));
    }

    @Override
    public void solve() {
        solver.findAllSolutions();
    }

    @Override
    public void prettyOut() {
    }
}