import java.util.ArrayList;

import java.util.List;

public class Race {

private List<Car> cars;

private Car leader;

public Race() {

this.cars = new ArrayList<>();

this.leader = null;

}

public void addCar(Car car) {

cars.add(car);

updateLeader();

}

public void addCars(List<Car> carList) {

this.cars.addAll(carList);

updateLeader();

}

private void updateLeader() {

if (cars.isEmpty()) {

leader = null;

return;

}

Car currentLeader = cars.get(0);

for (Car car : cars) {

if (car.getSpeed() > currentLeader.getSpeed()) {

currentLeader = car;

}

}

leader = currentLeader;

}

public Car getLeader() {

return leader;

}

public List<Car> getCars() {

return cars;

}

}