Package solver.constraints.nary

Source Code of solver.constraints.nary.SubcircuitTest

/**
*  Copyright (c) 1999-2014, Ecole des Mines de Nantes
*  All rights reserved.
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*  modification, are permitted provided that the following conditions are met:
*
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*      * 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
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/**
* Created by IntelliJ IDEA.
* User: Jean-Guillaume Fages
* Date: 12/06/12
* Time: 21:29
*/

package solver.constraints.nary;

import org.testng.Assert;
import org.testng.annotations.Test;
import solver.Cause;
import solver.Solver;
import solver.constraints.IntConstraintFactory;
import solver.variables.IntVar;
import solver.variables.VariableFactory;
import util.tools.ArrayUtils;

public class SubcircuitTest {

    @Test(groups = "1s")
    public static void test1() {
        Solver solver = new Solver();
        IntVar[] x = VariableFactory.boundedArray("x", 10, 0, 20, solver);
        solver.post(IntConstraintFactory.subcircuit(x, 0, VariableFactory.bounded("length", 0, x.length - 1, solver)));
        solver.findSolution();
        Assert.assertEquals(1, solver.getMeasures().getSolutionCount());
    }

    @Test(groups = "1s")
    public static void test2() {
        Solver solver = new Solver();
        IntVar[] x = VariableFactory.boundedArray("x", 5, 0, 4, solver);
        IntVar[] y = VariableFactory.boundedArray("y", 5, 5, 9, solver);
        IntVar[] vars = ArrayUtils.append(x, y);
        solver.post(IntConstraintFactory.subcircuit(vars, 0, VariableFactory.bounded("length", 0, vars.length - 1, solver)));
        solver.findSolution();
        Assert.assertTrue(solver.getMeasures().getSolutionCount() > 0);
    }

    @Test(groups = "1s")
    public static void test3() {
        Solver solver = new Solver();
        IntVar[] x = VariableFactory.enumeratedArray("x", 5, 0, 4, solver);
        IntVar[] y = VariableFactory.enumeratedArray("y", 5, 5, 9, solver);
        final IntVar[] vars = ArrayUtils.append(x, y);
        try {
            vars[1].removeValue(1, Cause.Null);
            vars[6].removeValue(6, Cause.Null);
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
        solver.post(IntConstraintFactory.subcircuit(vars, 0, VariableFactory.bounded("length", 0, vars.length - 1, solver)));
        solver.findSolution();
        Assert.assertTrue(solver.getMeasures().getSolutionCount() == 0);
    }

    @Test(groups = "1s")
    public static void test4() {
        Solver solver = new Solver();
        int n = 6;
        int min = 2;
        int max = 4;
        IntVar[] vars = VariableFactory.boundedArray("x", n, 0, n, solver);
        IntVar nb = VariableFactory.bounded("size", min, max, solver);
        solver.post(IntConstraintFactory.subcircuit(vars, 0, nb));
        solver.findAllSolutions();
        int nbSol = 0;
        for (int i = min; i <= max; i++) {
            nbSol += parmi(i, n) * factorial(i - 1);
        }
        Assert.assertEquals(solver.getMeasures().getSolutionCount(), nbSol);
    }

    private static int factorial(int n) {
        if (n <= 1) {
            return 1;
        } else {
            return n * factorial(n - 1);
        }
    }

    private static int parmi(int k, int n) {
        return factorial(n) / (factorial(k) * factorial(n - k));
    }
}
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