import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

public class Student {

    public static final int NPREF = 5;

    private School[] preferences = new School[NPREF];

    public Student(School... preferences) {
        for (int i = 0; i < NPREF && i < preferences.length; i++) {
            this.preferences[i] = preferences[i];
        }
    }

    public Student(List<School> preferences) {
        for (int i = 0; i < NPREF && i < preferences.size(); i++) {
            this.preferences[i] = preferences.get(i);
        }
    }

    public int getScore(School school) {
        for (int i = 0; i < NPREF; i++) {
            if (preferences[i] == school) return 1 << (NPREF - i - 1);
        }
        return 0;
    }

    public School[] getPreferences() {
        return Arrays.copyOf(preferences, NPREF);
    }

    public School getPreference(int i) {
        return preferences[i];
    }

    public String toString() {
        return Arrays.stream(preferences)
                .filter(Objects::nonNull)
                .mapToInt(School::getID)
                .mapToObj(Integer::toString)
                .collect(Collectors.joining(">"));
    }

}