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* Copyright (c) 1999-2014, Ecole des Mines de Nantes
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*
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* 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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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;
import util.ESat;
/**
* Simple example using a sum constraint on a large set of variables
*
* @author Jean-Guillaume Fages
* @since 22/06/12
*/
public class BigSum extends AbstractProblem {
int n = 1000;
IntVar[] vars;
@Override
public void createSolver() {
solver = new Solver("BigSum");
}
@Override
public void buildModel() {
vars = VariableFactory.boundedArray("v", n, 0, 5000, solver);
solver.post(IntConstraintFactory.sum(vars, VariableFactory.fixed(500000, solver)));
solver.post(IntConstraintFactory.alldifferent(vars, "BC"));
}
@Override
public void configureSearch() {
solver.set(IntStrategyFactory.lexico_LB(vars));
}
@Override
public void solve() {
solver.findSolution();
}
@Override
public void prettyOut() {
LoggerFactory.getLogger("bench").info("big sum");
StringBuilder st = new StringBuilder();
if (solver.isFeasible() == ESat.TRUE) {
for (int i = 0; i < n; i++) {
st.append(vars[i].getValue()).append(", ");
}
} else {
st.append("\tINFEASIBLE");
}
LoggerFactory.getLogger("bench").info(st.toString());
}
public static void main(String[] args) {
new BigSum().execute(args);
}
}