private RemiUtils() { public static IVecInt backbone(ISolver s) throws TimeoutException {
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| 1 | /* | |
| 2 | * SAT4J: a SATisfiability library for Java Copyright (C) 2004-2006 Daniel Le Berre | |
| 3 | * | |
| 4 | * Based on the original minisat specification from: | |
| 5 | * | |
| 6 | * An extensible SAT solver. Niklas E?n and Niklas S?rensson. Proceedings of the | |
| 7 | * Sixth International Conference on Theory and Applications of Satisfiability | |
| 8 | * Testing, LNCS 2919, pp 502-518, 2003. | |
| 9 | * | |
| 10 | * This library is free software; you can redistribute it and/or modify it under | |
| 11 | * the terms of the GNU Lesser General Public License as published by the Free | |
| 12 | * Software Foundation; either version 2.1 of the License, or (at your option) | |
| 13 | * any later version. | |
| 14 | * | |
| 15 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
| 16 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
| 17 | * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more | |
| 18 | * details. | |
| 19 | * | |
| 20 | * You should have received a copy of the GNU Lesser General Public License | |
| 21 | * along with this library; if not, write to the Free Software Foundation, Inc., | |
| 22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 23 | * | |
| 24 | */ | |
| 25 | package org.sat4j.tools; | |
| 26 | ||
| 27 | import org.sat4j.core.VecInt; | |
| 28 | import org.sat4j.specs.ISolver; | |
| 29 | import org.sat4j.specs.IVecInt; | |
| 30 | import org.sat4j.specs.TimeoutException; | |
| 31 | ||
| 32 | /** | |
| 33 | * Class dedicated to Remi Coletta utility methods :-) | |
| 34 | * | |
| 35 | * @author leberre | |
| 36 | */ | |
| 37 | public class RemiUtils { | |
| 38 | ||
| 39 | 0 |
private RemiUtils() { |
| 40 | // no instanceof that class are expected to be used. | |
| 41 | } | |
| 42 | ||
| 43 | /** | |
| 44 | * Compute the set of literals common to all models of the formula. | |
| 45 | * | |
| 46 | * @param s | |
| 47 | * a solver already feeded | |
| 48 | * @return the set of literals common to all models of the formula contained | |
| 49 | * in the solver, in dimacs format. | |
| 50 | * @throws TimeoutException | |
| 51 | */ | |
| 52 | 0 |
public static IVecInt backbone(ISolver s) throws TimeoutException { |
| 53 | 0 | IVecInt backbone = new VecInt(); |
| 54 | 0 | int nvars = s.nVars(); |
| 55 | 0 | for (int i = 1; i <= nvars; i++) { |
| 56 | 0 | backbone.push(i); |
| 57 | 0 | if (s.isSatisfiable(backbone)) { |
| 58 | 0 | backbone.pop().push(-i); |
| 59 | 0 | if (s.isSatisfiable(backbone)) { |
| 60 | 0 | backbone.pop(); |
| 61 | } else { | |
| 62 | // -i is in the backbone | |
| 63 | 0 | backbone.pop().push(i); |
| 64 | } | |
| 65 | } else { | |
| 66 | // -i is in the backbone | |
| 67 | 0 | backbone.pop().push(-i); |
| 68 | } | |
| 69 | } | |
| 70 | 0 | return backbone; |
| 71 | } | |
| 72 | ||
| 73 | } | |
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