#include <iostream>
#include <vector>
using namespace std;
class Squares: vector<int> {
public:
	Squares(unsigned n) :
		vector<int> (n) {
		for (unsigned k = 0; k < n; k++)
			(*this)[k] = k * k;
	}
	ostream& print(ostream& out) const {
		const_iterator pos; // must be const_iterator
		for (pos = begin(); pos != end(); pos++)
			out << *pos << endl;
		return out;
	}
};

int main() {
	Squares sq(10);
	sq.print(cout);
}