import java.util.HashSet;
import java.util.concurrent.Semaphore;

public class BasketballTournament {

    public static void main(String[] args) {
        HashSet<Player> threads = new HashSet<>();
        for (int i = 0; i < 100; i++) {
            Player p = new Player();
            threads.add(p);
        }
        // run all threads in background
        for(Player p : threads) {
            p.start();
        }
        // after all of them are started, wait each of them to finish for maximum 5_000 ms
        for(Player p : threads) {
            try {
                p.join(5000);
            }
            catch (InterruptedException e) {

            }
        }
        // for each thread, terminate it if it is not finished
        for(Player p : threads) {
            if(p.isAlive()) {
                System.out.println("Possible deadlock!");
                return;
            }
        }
        System.out.println("Tournament finished.");

    }
}

class Player extends Thread {
    static Semaphore sala = new Semaphore(20);
    static Semaphore soblekuvalna = new Semaphore(0);
    static int igraci_vo_salata = 0;
    void enter_sala() throws InterruptedException{
        sala.acquire();
        soblekuvalna.release();
    }
    void exit_sala() {
        sala.release();
    }
    void enter_soblekuvalna() throws InterruptedException{
        soblekuvalna.acquire();
    }
    void exit_soblekuvalna() {
        soblekuvalna.release();
    }
    public void execute() throws InterruptedException {
        // at most 20 players should print this in parallel
        enter_sala();
        System.out.println("Player inside.");
        // at most 10 players may enter in the dressing room in parallel
        enter_soblekuvalna();
        System.out.println("In dressing room.");
        Thread.sleep(10);// this represent the dressing time
        // after all players are ready, they should start with the game together
        exit_soblekuvalna();
        System.out.println("Game started.");
        Thread.sleep(100);// this represent the game duration

        System.out.println("Player done.");
        exit_sala();
        // only one player should print the next line, representing that the game has finished
        synchronized (Player.class) {
            igraci_vo_salata++;
            if (igraci_vo_salata == 20) {
                System.out.println("Game finished.");
                igraci_vo_salata = 0;
            }
        }
    }
    @Override
    public void run() {
        try {
            execute();
        }
        catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}