sh.cpp

template < typename T >
istream& operator>> (istream &cin,  V<T> &arr) {
	for (T &val : arr) {
		cin >> val;
	}
	return cin;
}
template < typename T >
ostream& operator<< (ostream &cout, VV<T> &arr) {
	for (V<T> &val : arr) {
		cout << val << endl;
	}
	return cout;
}
template < typename T >
ostream& operator<< (ostream &cout, V<T> &arr) {
	for (T &val : arr) {
		cout << val << " ";
	}
	return cout;
}