#include <iostream>
#include <vector>
using namespace std;
class Squares : vector<int> {
public:
  Squares(unsigned n) { for (unsigned k=0; k<n; k++) push_back(k*k); }
  ostream& print(ostream& out) const {
    for (unsigned k=0; k<size(); k++) out<< (*this)[k]<< endl;
    return out; }
};
int main() {
  Squares sq(10);
  sq.print(cout);
}