#include<iostream>
#include<stdio.h>
#include<vector>
using namespace std;

class Subject{
public:
	vector<class Observer*> myObservers;
	Subject()
	{
		myObservers.clear();
	}
	void addObserver(Observer *obs)
	{
		myObservers.push_back(obs);

	}
	void notifyObservers();
	void doIt(){
		this->notifyObservers();
	}

};
class Observer{
public:
	Subject* subiect;
	virtual void update() = 0;


};
void Subject::notifyObservers()
{
	vector<Observer*>::iterator it;
	for (it = myObservers.begin(); it != myObservers.end(); ++it)
		(*it)->update();
}

class ObsA : public Observer
{
public:
	ObsA(Subject *sub1)
	{
		this->subiect = sub1;
	}
	void update()
	{
		printf("IT'S UPDATED 1\n");
	}
};
class ObsB : public Observer
{
public:
	ObsB(Subject *sub2)
	{
		this->subiect = sub2;
	}
	void update()
	{
		printf("IT'S UPDATED 2\n");
	}
};
void main()

{
	Subject *sub = new Subject();
	ObsA *obs1 = new ObsA(sub);
	ObsB *obs2 = new ObsB(sub);
	sub->addObserver(obs1);
	sub->addObserver(obs2);
	sub->doIt();
	int n;
	cin >> n;
}