#include <vector>
#include <iostream>

using namespace std;

/* This one may well work with some compilers/OS, and crash with
   others. Who said the STL was safe ?? */

int main() {
  vector<int> v;
  v.push_back(1);
  v.push_back(2);
  v.push_back(3);
  v.push_back(4);
  for (vector<int>::iterator i = v.begin();
       i != v.end(); i++) {
    cout << *i << endl;
    if (*i == 1) {
      v.push_back(5);
    }
  }
}