Package samples.integer

Source Code of samples.integer.Alpha

/**
*  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.integer;

import org.slf4j.LoggerFactory;
import samples.AbstractProblem;
import solver.Solver;
import solver.constraints.IntConstraintFactory;
import solver.search.strategy.IntStrategyFactory;
import solver.variables.IntVar;
import solver.variables.VariableFactory;

/**
* A verbal arithmetic puzzle:
* <br/> <br/>
* Attribute a value to each letter, such that the equations are correct.
* <p/>
* <br/>
*
* @author Charles Prud'homme
* @since 02/08/11
*/
public class Alpha extends AbstractProblem {

    IntVar[] letters;

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

    @Override
    public void buildModel() {
        letters = new IntVar[26];
        for (int i = 0; i < 26; i++) {
            letters[i] = VariableFactory.bounded("" + (char) (97 + i), 1, 26, solver);
        }
        solver.post(IntConstraintFactory.sum(extract("ballet"), VariableFactory.fixed(45, solver)));
        solver.post(IntConstraintFactory.sum(extract("cello"), VariableFactory.fixed(43, solver)));
        solver.post(IntConstraintFactory.sum(extract("concert"), VariableFactory.fixed(74, solver)));
        solver.post(IntConstraintFactory.sum(extract("flute"), VariableFactory.fixed(30, solver)));
        solver.post(IntConstraintFactory.sum(extract("fugue"), VariableFactory.fixed(50, solver)));
        solver.post(IntConstraintFactory.sum(extract("glee"), VariableFactory.fixed(66, solver)));
        solver.post(IntConstraintFactory.sum(extract("jazz"), VariableFactory.fixed(58, solver)));
        solver.post(IntConstraintFactory.sum(extract("lyre"), VariableFactory.fixed(47, solver)));
        solver.post(IntConstraintFactory.sum(extract("oboe"), VariableFactory.fixed(53, solver)));
        solver.post(IntConstraintFactory.sum(extract("opera"), VariableFactory.fixed(65, solver)));
        solver.post(IntConstraintFactory.sum(extract("polka"), VariableFactory.fixed(59, solver)));
        solver.post(IntConstraintFactory.sum(extract("quartet"), VariableFactory.fixed(50, solver)));
        solver.post(IntConstraintFactory.sum(extract("saxophone"), VariableFactory.fixed(134, solver)));
        solver.post(IntConstraintFactory.sum(extract("scale"), VariableFactory.fixed(51, solver)));
        solver.post(IntConstraintFactory.sum(extract("solo"), VariableFactory.fixed(37, solver)));
        solver.post(IntConstraintFactory.sum(extract("song"), VariableFactory.fixed(61, solver)));
        solver.post(IntConstraintFactory.sum(extract("soprano"), VariableFactory.fixed(82, solver)));
        solver.post(IntConstraintFactory.sum(extract("theme"), VariableFactory.fixed(72, solver)));
        solver.post(IntConstraintFactory.sum(extract("violin"), VariableFactory.fixed(100, solver)));
        solver.post(IntConstraintFactory.sum(extract("waltz"), VariableFactory.fixed(34, solver)));
        solver.post(IntConstraintFactory.alldifferent(letters, "BC"));
    }

    private IntVar[] extract(String word) {
        IntVar[] ivars = new IntVar[word.length()];
        for (int i = 0; i < word.length(); i++) {
            ivars[i] = letters[word.charAt(i) - 97];
        }
        return ivars;
    }

    @Override
    public void configureSearch() {
        solver.set(IntStrategyFactory.minDom_LB(letters));
    }

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

    @Override
    public void prettyOut() {
        LoggerFactory.getLogger("bench").info("Alpha");
        StringBuilder st = new StringBuilder();
        st.append("\t");
        for (int i = 0; i < 26; i++) {
            st.append(letters[i].getName()).append("= ").append(letters[i].getValue()).append(" ");
            if (i % 6 == 5) {
                st.append("\n\t");
            }
        }
        st.append("\n");
        LoggerFactory.getLogger("bench").info(st.toString());
    }

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