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1   /*******************************************************************************
2    * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
3    *
4    * All rights reserved. This program and the accompanying materials
5    * are made available under the terms of the Eclipse Public License v1.0
6    * which accompanies this distribution, and is available at
7    *  http://www.eclipse.org/legal/epl-v10.html
8    *
9    * Alternatively, the contents of this file may be used under the terms of
10   * either the GNU Lesser General Public License Version 2.1 or later (the
11   * "LGPL"), in which case the provisions of the LGPL are applicable instead
12   * of those above. If you wish to allow use of your version of this file only
13   * under the terms of the LGPL, and not to allow others to use your version of
14   * this file under the terms of the EPL, indicate your decision by deleting
15   * the provisions above and replace them with the notice and other provisions
16   * required by the LGPL. If you do not delete the provisions above, a recipient
17   * may use your version of this file under the terms of the EPL or the LGPL.
18   *
19   * Based on the original MiniSat specification from:
20   *
21   * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
22   * Sixth International Conference on Theory and Applications of Satisfiability
23   * Testing, LNCS 2919, pp 502-518, 2003.
24   *
25   * See www.minisat.se for the original solver in C++.
26   *
27   * Contributors:
28   *   CRIL - initial API and implementation
29   *******************************************************************************/
30  package org.sat4j.minisat.core;
31  
32  import static org.junit.Assert.assertEquals;
33  import static org.junit.Assert.assertFalse;
34  import static org.junit.Assert.assertTrue;
35  
36  import org.junit.Test;
37  import org.sat4j.core.VecInt;
38  import org.sat4j.minisat.SolverFactory;
39  import org.sat4j.opt.MaxSatDecorator;
40  import org.sat4j.specs.ContradictionException;
41  import org.sat4j.specs.ISolver;
42  import org.sat4j.specs.IVecInt;
43  import org.sat4j.specs.TimeoutException;
44  import org.sat4j.tools.ModelIterator;
45  import org.sat4j.tools.OptToSatAdapter;
46  
47  public class Bug275101 {
48  
49      @Test
50      public void testMaxSAtIteratorIfSat() throws ContradictionException,
51              TimeoutException {
52          ISolver solver = new ModelIterator(new OptToSatAdapter(
53                  new MaxSatDecorator(SolverFactory.newDefault())));
54          solver.newVar(3);
55          IVecInt literals = new VecInt();
56          literals.push(-1).push(-2).push(3);
57          solver.addClause(literals);
58          literals.clear();
59          literals.push(-1).push(2);
60          solver.addClause(literals);
61          literals.clear();
62          literals.push(-1).push(-3);
63          solver.addClause(literals);
64          literals.clear();
65          assertTrue(solver.isSatisfiable());
66          assertEquals(3, solver.model().length);
67          System.out.println("" + solver.model(1) + solver.model(2)
68                  + solver.model(3));
69          assertTrue(solver.isSatisfiable());
70          assertEquals(3, solver.model().length);
71          System.out.println("" + solver.model(1) + solver.model(2)
72                  + solver.model(3));
73          assertTrue(solver.isSatisfiable());
74          assertEquals(3, solver.model().length);
75          System.out.println("" + solver.model(1) + solver.model(2)
76                  + solver.model(3));
77          assertTrue(solver.isSatisfiable());
78          assertEquals(3, solver.model().length);
79          System.out.println("" + solver.model(1) + solver.model(2)
80                  + solver.model(3));
81          assertFalse(solver.isSatisfiable());
82      }
83  
84      @Test
85      public void testMaxSAtIterator() throws ContradictionException,
86              TimeoutException {
87          ISolver solver = new ModelIterator(new OptToSatAdapter(
88                  new MaxSatDecorator(SolverFactory.newDefault())));
89          solver.newVar(2);
90          IVecInt literals = new VecInt();
91          literals.push(-1).push(-2);
92          solver.addClause(literals);
93          literals.clear();
94          literals.push(-1).push(2);
95          solver.addClause(literals);
96          literals.clear();
97          literals.push(1).push(-2);
98          solver.addClause(literals);
99          literals.clear();
100         literals.push(1).push(2);
101         solver.addClause(literals);
102         assertTrue(solver.isSatisfiable());
103         assertEquals(2, solver.model().length);
104         System.out.println("" + solver.model(1) + solver.model(2));
105         assertTrue(solver.isSatisfiable());
106         assertEquals(2, solver.model().length);
107         System.out.println("" + solver.model(1) + solver.model(2));
108         assertTrue(solver.isSatisfiable());
109         assertEquals(2, solver.model().length);
110         System.out.println("" + solver.model(1) + solver.model(2));
111         assertTrue(solver.isSatisfiable());
112         assertEquals(2, solver.model().length);
113         System.out.println("" + solver.model(1) + solver.model(2));
114         assertFalse(solver.isSatisfiable());
115     }
116 }