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| package org.sat4j.reader; |
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| |
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| import java.io.IOException; |
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| import java.io.LineNumberReader; |
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| import java.util.Scanner; |
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| import java.util.StringTokenizer; |
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| |
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| import org.sat4j.core.VecInt; |
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| import org.sat4j.specs.ContradictionException; |
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| import org.sat4j.specs.ISolver; |
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| import org.sat4j.specs.IVecInt; |
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| public class ExtendedDimacsReader extends DimacsReader { |
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| |
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| public static final int FALSE = 1; |
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| |
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| public static final int TRUE = 2; |
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| |
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| public static final int NOT = 3; |
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| |
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| public static final int AND = 4; |
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| |
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| public static final int NAND = 5; |
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| |
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| public static final int OR = 6; |
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| |
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| public static final int NOR = 7; |
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| |
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| public static final int XOR = 8; |
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| |
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| public static final int XNOR = 9; |
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| |
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| public static final int IMPLIES = 10; |
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| |
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| public static final int IFF = 11; |
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| |
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| public static final int IFTHENELSE = 12; |
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| |
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| public static final int ATLEAST = 13; |
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| |
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| public static final int ATMOST = 14; |
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| public static final int COUNT = 15; |
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| private static final long serialVersionUID = 1L; |
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| public ExtendedDimacsReader(ISolver solver) {
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59 |
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| super(solver);
|
60 |
| } |
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| @Override
|
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| protected void readProblemLine(LineNumberReader in) throws IOException, |
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| ParseFormatException { |
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| |
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| String line = in.readLine();
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| if (line == null) {
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| throw new ParseFormatException(
|
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| "premature end of file: <p noncnf ...> expected on line " |
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| + in.getLineNumber()); |
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| } |
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| StringTokenizer stk = new StringTokenizer(line);
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| |
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| if (!(stk.hasMoreTokens() && stk.nextToken().equals("p")
|
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| && stk.hasMoreTokens() && stk.nextToken().equals("noncnf"))) { |
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| throw new ParseFormatException(
|
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| "problem line expected (p noncnf ...) on line " |
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| + in.getLineNumber()); |
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| } |
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| |
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| int vars;
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| vars = Integer.parseInt(stk.nextToken());
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| assert vars > 0; |
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| solver.newVar(vars);
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| try {
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| processClause(new VecInt().push(vars));
|
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| } catch (ContradictionException e) { |
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| assert false; |
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| System.err.println("Contradiction when asserting root variable?");
|
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| } |
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| disableNumberOfConstraintCheck();
|
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| } |
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| @Override
|
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| protected boolean handleConstr(String line, IVecInt literals) |
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| throws ContradictionException { |
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| boolean added = true;
|
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| assert literals.size() == 0; |
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| Scanner scan = new Scanner(line);
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117 |
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| while (scan.hasNext()) {
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| int gateType = scan.nextInt();
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| assert gateType > 0; |
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| int nbparam = scan.nextInt();
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| assert nbparam != 0; |
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| assert nbparam == -1 || gateType >= ATLEAST; |
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| int k = -1;
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| for (int i = 0; i < nbparam; i++) {
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| k = scan.nextInt();
|
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| } |
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| |
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| int y = scan.nextInt();
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| int x;
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| while ((x = scan.nextInt()) != 0) {
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| literals.push(x);
|
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| } |
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| assert literals.size()==k; |
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| switch (gateType) {
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| case FALSE:
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| gateFalse(y, literals);
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| break;
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| case TRUE:
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| gateTrue(y, literals);
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| break;
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| case OR:
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| or(y, literals);
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| break;
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| case NOT:
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| not(y, literals);
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| break;
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| case AND:
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| and(y, literals);
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| break;
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| case XOR:
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| xor(y, literals);
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| break;
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| case IFF:
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| iff(y, literals);
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| break;
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| case IFTHENELSE:
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| ite(y, literals);
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| break;
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159 |
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| default:
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| throw new UnsupportedOperationException("Gate type "
|
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| + gateType + " not handled yet"); |
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| } |
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| } |
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| literals.clear();
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| return added;
|
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| } |
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| |
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| private void gateFalse(int y, IVecInt literals)
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| throws ContradictionException { |
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| assert literals.size() == 0; |
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| IVecInt clause = new VecInt(1);
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| clause.push(-y);
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| processClause(clause);
|
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| } |
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| |
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| private void gateTrue(int y, IVecInt literals)
|
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| throws ContradictionException { |
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| assert literals.size() == 0; |
179 |
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| IVecInt clause = new VecInt(1);
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| clause.push(y);
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| processClause(clause);
|
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| } |
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| |
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| private void ite(int y, IVecInt literals) throws ContradictionException {
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| assert literals.size() == 3; |
186 |
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| IVecInt clause = new VecInt(2);
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| clause.push(-y).push(-literals.get(0)).push(literals.get(1));
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| processClause(clause);
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| clause.clear();
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| clause.push(-y).push(literals.get(0)).push(literals.get(2));
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| processClause(clause);
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| clause.clear();
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| clause.push(-literals.get(0)).push(-literals.get(1)).push(y);
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| processClause(clause);
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| clause.clear();
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205 |
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| clause.push(literals.get(0)).push(-literals.get(2)).push(y);
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206 |
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| processClause(clause);
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207 |
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| clause.clear();
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208 |
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| clause.push(-literals.get(1)).push(-literals.get(2)).push(y);
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209 |
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| processClause(clause);
|
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| } |
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| |
212 |
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| private void and(int y, IVecInt literals) throws ContradictionException {
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| IVecInt clause = new VecInt(literals.size() + 1);
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217 |
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| clause.push(y);
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218 |
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| for (int i = 0; i < literals.size(); i++) {
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219 |
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| clause.push(-literals.get(i));
|
220 |
| } |
221 |
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| processClause(clause);
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| clause.clear();
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223 |
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| for (int i = 0; i < literals.size(); i++) {
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| |
225 |
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| clause.clear();
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226 |
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| clause.push(-y);
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227 |
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| clause.push(literals.get(i));
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228 |
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| processClause(clause);
|
229 |
| } |
230 |
| } |
231 |
| |
232 |
0
| private void or(int y, IVecInt literals) throws ContradictionException {
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| |
234 |
| |
235 |
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| IVecInt clause = new VecInt(literals.size() + 1);
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236 |
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| literals.copyTo(clause);
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237 |
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| clause.push(-y);
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238 |
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| processClause(clause);
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239 |
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| clause.clear();
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240 |
0
| for (int i = 0; i < literals.size(); i++) {
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| |
242 |
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| clause.clear();
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| clause.push(y);
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| clause.push(-literals.get(i));
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245 |
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| processClause(clause);
|
246 |
| } |
247 |
| } |
248 |
| |
249 |
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| private void processClause(IVecInt clause) throws ContradictionException {
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250 |
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| solver.addClause(clause);
|
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| } |
252 |
| |
253 |
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| private void not(int y, IVecInt literals) throws ContradictionException {
|
254 |
| assert literals.size() == 1; |
255 |
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| IVecInt clause = new VecInt(2);
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| |
257 |
| |
258 |
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| clause.push(-y).push(-literals.get(0));
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259 |
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| processClause(clause);
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| |
261 |
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| clause.clear();
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262 |
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| clause.push(y).push(literals.get(0));
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263 |
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| processClause(clause);
|
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| } |
265 |
| |
266 |
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| void xor(int y, IVecInt literals) throws ContradictionException {
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267 |
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| literals.push(-y);
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268 |
0
| int[] f = new int[literals.size()];
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269 |
0
| literals.copyTo(f);
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270 |
0
| xor2Clause(f, 0, false);
|
271 |
| } |
272 |
| |
273 |
0
| void iff(int y, IVecInt literals) throws ContradictionException {
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274 |
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| literals.push(y);
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275 |
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| int[] f = new int[literals.size()];
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276 |
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| literals.copyTo(f);
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277 |
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| iff2Clause(f, 0, false);
|
278 |
| } |
279 |
| |
280 |
0
| void xor2Clause(int[] f, int prefix, boolean negation)
|
281 |
| throws ContradictionException { |
282 |
0
| if (prefix == f.length - 1) {
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283 |
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| IVecInt clause = new VecInt(f.length);
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284 |
0
| for (int i = 0; i < f.length - 1; ++i) {
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285 |
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| clause.push(f[i]);
|
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| } |
287 |
0
| clause.push(f[f.length - 1] * (negation ? -1 : 1));
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288 |
0
| processClause(clause);
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289 |
0
| return;
|
290 |
| } |
291 |
| |
292 |
0
| if (negation) {
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293 |
0
| f[prefix] = -f[prefix];
|
294 |
0
| xor2Clause(f, prefix + 1, false);
|
295 |
0
| f[prefix] = -f[prefix];
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296 |
| |
297 |
0
| xor2Clause(f, prefix + 1, true);
|
298 |
| } else { |
299 |
0
| xor2Clause(f, prefix + 1, false);
|
300 |
| |
301 |
0
| f[prefix] = -f[prefix];
|
302 |
0
| xor2Clause(f, prefix + 1, true);
|
303 |
0
| f[prefix] = -f[prefix];
|
304 |
| } |
305 |
| } |
306 |
| |
307 |
0
| void iff2Clause(int[] f, int prefix, boolean negation)
|
308 |
| throws ContradictionException { |
309 |
0
| if (prefix == f.length - 1) {
|
310 |
0
| IVecInt clause = new VecInt(f.length);
|
311 |
0
| for (int i = 0; i < f.length - 1; ++i) {
|
312 |
0
| clause.push(f[i]);
|
313 |
| } |
314 |
0
| clause.push(f[f.length - 1] * (negation ? -1 : 1));
|
315 |
0
| processClause(clause);
|
316 |
0
| return;
|
317 |
| } |
318 |
| |
319 |
0
| if (negation) {
|
320 |
0
| iff2Clause(f, prefix + 1, false);
|
321 |
0
| f[prefix] = -f[prefix];
|
322 |
0
| iff2Clause(f, prefix + 1, true);
|
323 |
0
| f[prefix] = -f[prefix];
|
324 |
| } else { |
325 |
0
| f[prefix] = -f[prefix];
|
326 |
0
| iff2Clause(f, prefix + 1, false);
|
327 |
0
| f[prefix] = -f[prefix];
|
328 |
0
| iff2Clause(f, prefix + 1, true);
|
329 |
| } |
330 |
| } |
331 |
| |
332 |
| } |