import javax.swing.plaf.TableHeaderUI;
import java.awt.geom.AffineTransform;
import java.lang.invoke.SwitchPoint;
import java.util.concurrent.Semaphore;
import java.util.*;
public class Vinegar {
    public static void main(String args[])  throws InterruptedException{
        init();
        HashSet threads = new HashSet<>();
        for (int i = 0; i < 20; i++) {
            threads.add(new C());
            threads.add(new H());
            threads.add(new H());
            threads.add(new O());
        }
        for(int i = 0; i < 20; i++) {
            threads.add(new H());
        }
        // run all threads in background
for(Thread t : threads) {
    t.start();
}
for(Thread t : threads) {
    t.join(2000);
}
for(Thread t : threads) {
    if(t.isAlive()) {
        System.out.println("Possible deadlock!");
    return;
    }
}
        // after all of them are started, wait each of them to finish for maximum 2_000 ms

        // for each thread, terminate it if it is not finished
        System.out.println("Process finished.");
    }
    static Semaphore c;
    static Semaphore h;
    static Semaphore o;
    static Semaphore c_created;
    static Semaphore h_created;
    static Semaphore o_created;
    static Semaphore boss;

    private static void init() {
        c = new Semaphore(2);
        h = new Semaphore(4);
        o = new Semaphore(2);
        c_created = new Semaphore(0);
        h_created = new Semaphore(0);
        o_created = new Semaphore(0);
        boss = new Semaphore(0);
    }
    static class C extends Thread {

        private void excecute() throws InterruptedException {


            // at most 2 atoms should print this in parallel
            c.acquire(1);

            System.out.println("C here.");
            c_created.release(6);
            h_created.acquire(1);
            o_created.acquire(1);
            // after all atoms are present, they should start with the bonding process together
            System.out.println("Molecule bonding.");
            Thread.sleep(100);// this represent the bonding process
            boss.release(6);

            System.out.println("C done.");
            // only one atom should print the next line, representing that the molecule is created
            c.release(1);

            System.out.println("Molecule created.");
        }

        @Override
        public void run() {
            try {
                excecute();
            } catch (InterruptedException e) {

            }
        }
    }
    static class H extends Thread {
        private void excecute() throws InterruptedException{

            // at most 4 atoms should print this in parallel
            System.out.println("H here.");
            h.acquire(1);

            // after all atoms are present, they should start with the bonding process together
            c_created.acquire(1);
            h_created.release(4);
            o_created.acquire(1);
            System.out.println("Molecule bonding.");
            Thread.sleep(100);// this represent the bonding process
            boss.acquire(1);

            System.out.println("H done.");
            // only one atom should print the next line, representing that the molecule is created
            h.release();

            System.out.println("Molecule created.");
        }
        @Override
        public void run() {
            try {
                excecute();

            }
            catch (InterruptedException e) {

            }
        }
    }
    static class O extends Thread {
        private void excecute() throws InterruptedException{


            // at most 2 atoms should print this in parallel
            o.acquire(1);
            System.out.println("O here.");
            // after all atoms are present, they should start with the bonding process together

            c_created.acquire(1);
            h_created.acquire(1);
            o_created.release(6);
            System.out.println("Molecule bonding.");
            Thread.sleep(100);// this represent the bonding process
            boss.acquire(1);

            System.out.println("O done.");
            // only one atom should print the next line, representing that the molecule is created
            o.release(1);

            System.out.println("Molecule created.");
        }
        @Override
        public void run() {
            try {
                excecute();
            }
            catch (InterruptedException e) {

            }
        }
    }

}