import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import JaCoP.constraints.Alldifferent;
import JaCoP.constraints.Distance;
import JaCoP.constraints.XeqC;
import JaCoP.constraints.XeqY;
import JaCoP.constraints.XplusCeqZ;
import JaCoP.core.Domain;
import JaCoP.core.IntDomain;
import JaCoP.core.IntVar;
import JaCoP.core.Store;
import JaCoP.search.DepthFirstSearch;
import JaCoP.search.IndomainMin;
import JaCoP.search.InputOrderSelect;
import JaCoP.search.Search;
import JaCoP.search.SelectChoicePoint;
public class Einstein {
static final int size = 5;
static final Store store = new Store();
static final IntVar kOne = new IntVar(store, 1, 1);
public enum Nation {
England, Sweden, Danmark, Norway, Germany;
IntVar v = new IntVar(store, name(), 0, size - 1);
static IntVar[] values = getValues(values());
}
public enum Drink {
Tea, Coffee, Milk, Beer, Water;
IntVar v = new IntVar(store, name(), 0, size - 1);
static IntVar[] values = getValues(values());
}
public enum Color {
Red, Green, Yellow, Blue, White;
IntVar v = new IntVar(store, name(), 0, size - 1);
static IntVar[] values = getValues(values());
}
public enum Pet {
Dog, Bird, Horse, Cat, Fish;
IntVar v = new IntVar(store, name(), 0, size - 1);
static IntVar[] values = getValues(values());
}
public enum Cigar {
PallMall, Dunhill, BlueMaster, Prince, Blends;
IntVar v = new IntVar(store, name(), 0, size - 1);
static IntVar[] values = getValues(values());
}
public static <T> IntVar[] getValues(T[] x) {
IntVar[] values = new IntVar[x.length];
for (int i = 0; i < values.length; ++i) {
try {
Field f = x[0].getClass().getDeclaredField("v");
values[i] = (IntVar) f.get(x[i]);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
return values;
}
public static void main(String[] args) throws Exception {
store.impose(new Alldifferent(Nation.values));
store.impose(new Alldifferent(Drink.values));
store.impose(new Alldifferent(Color.values));
store.impose(new Alldifferent(Pet.values));
store.impose(new Alldifferent(Cigar.values));
store.impose(new XeqY(Nation.England.v, Color.Red.v)); // 1
store.impose(new XeqY(Nation.Sweden.v, Pet.Dog.v)); // 2
store.impose(new XeqY(Nation.Danmark.v, Drink.Tea.v)); // 3
store.impose(new XplusCeqZ(Color.Green.v, 1, Color.White.v)); // 4
store.impose(new XeqY(Color.Green.v, Drink.Coffee.v)); // 5
store.impose(new XeqY(Cigar.PallMall.v, Pet.Bird.v)); // 6
store.impose(new XeqY(Color.Yellow.v, Cigar.Dunhill.v)); // 7
store.impose(new XeqC(Drink.Milk.v, 2)); // 8
store.impose(new XeqC(Nation.Norway.v, 0)); // 9
store.impose(new Distance(Cigar.Blends.v, Pet.Cat.v, kOne)); // 10
store.impose(new Distance(Cigar.Dunhill.v, Pet.Horse.v, kOne)); // 11
store.impose(new XeqY(Cigar.BlueMaster.v, Drink.Beer.v)); // 12
store.impose(new XeqY(Nation.Germany.v, Cigar.Prince.v)); // 13
store.impose(new Distance(Nation.Norway.v, Color.Blue.v, kOne)); // 14
store.impose(new Distance(Cigar.Blends.v, Drink.Water.v, kOne)); // 15
run();
}
private static void run() {
ArrayList<IntVar> all = new ArrayList<IntVar>();
all.addAll(Arrays.asList(Nation.values));
all.addAll(Arrays.asList(Drink.values));
all.addAll(Arrays.asList(Color.values));
all.addAll(Arrays.asList(Pet.values));
all.addAll(Arrays.asList(Cigar.values));
IntVar[] vars = new IntVar[all.size()];
all.toArray(vars);
Search<IntVar> search = new DepthFirstSearch<IntVar>();
SelectChoicePoint<IntVar> select = new InputOrderSelect<IntVar>(
store, vars, new IndomainMin<IntVar>());
search.getSolutionListener().searchAll(true);
search.getSolutionListener().recordSolutions(true);
boolean result = search.labeling(store, select);
if (result) {
for (int i = 0; i < search.getSolutionListener().solutionsNo(); ++i) {
Domain[] solution = search.getSolution(i + 1);
print(vars, solution);
}
// search.getSolutionListener().printAllSolutions();
}
}
private static void print(IntVar[] vars, Domain[] solution) {
for (int i = 0; i < solution.length; i += size) {
String[] names = new String[size];
for (int j = 0; j < size; ++j) {
IntDomain x = (IntDomain) solution[i + j];
int idx = x.getElementAt(0);
names[idx] = vars[i + j].id;
}
for (String name : names) {
System.out.printf("%11s ", name);
}
System.out.println();
}
System.out.println();
}
}