2

#include <iostream>

using namespace std;

class IntArray{
    private:
        int n;
    public:
        int *a = new int;
        IntArray(int _n){
            n = _n;
            //cout << _n << endl;
        }
        friend istream & operator >> (istream &, IntArray &);
        friend ostream & operator << (ostream &, const IntArray &);
        int & operator [](int )const ;
        int size(){
            return n;
        }
        ~IntArray(){

        }

};

int &IntArray::operator [](int i) const
{
    return a[i];
}


istream & operator >> (istream & in, IntArray & a)
{
    int _n = a.n;
    for (auto i = 0; i < _n; ++i)
    {
        in >> a[i];
    }
    return in;


}
ostream & operator <<(ostream & out, const IntArray & a)
{
    int _n = a.n;
    for (auto i = 0; i < _n; ++i)
    {
        out << a[i] << " ";
    }
    return out;
}