#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);
}