#include <iostream>
using namespace std;
class A {
int x;
public:
A(int i = 2)
: x(i)
{
}
int get_x() const { return x; }
};
class B : public A {
int* y;
public:
B(int i = 2)
: A(i)
{
y = new int[i];
for (int j = 0; j < i; j++)
y[j] = 1;
}
int& operator[](int i) const { return y[i]; }
};
ostream& operator<<(ostream& o, const B &b)
{
for (int i = 0; i < b.get_x(); i++)
o << b[i];
return o;
}
int main()
{
const B b(5);
b[2] = 3; b[4] = 5;
cout << b;
return 0;
}