public General(Data data) {
		this.cities = data.getCities();
		this.catalog = data.getCatalog();
		this.excludedCities = new HashSet<>();
		//
		for (City city : catalog) {
			System.out.println(city.getName() + " - " + city.getSource());
		}
	}

		for(String[] pairCity: data.getPairCities()) {
			Data copyData = (Data) data.clone();
			General gen = new General(copyData);
			gen.resolve(pairCity);
		}

public class Data {
	
	private int cities;
	
	private List<City> catalog = new ArrayList<>();
	
	private List<String[]> pairCities = new ArrayList<>();	

	public int getCities() {
		return cities;
	}
	public void setCities(int cities) {
		this.cities = cities;
	}
	public List<City> getCatalog() {
		return catalog;
	}
	public void setCatalog(List<City> catalog) {
		this.catalog = catalog;
	}
	public List<String[]> getPairCities() {
		return pairCities;
	}
	public void setPairCities(List<String[]> pairCities) {
		this.pairCities = pairCities;
	}
}

	private List<String[]> pairCities = new ArrayList<>();