#include <vector>
#include <iostream>

using namespace std;

int
main(void)
{
  vector<char> bla;
  bla.reserve(2);
  bla.push_back('a');
  char* p = &bla.at(0);
  cout << *p << endl;
  bla.push_back('b');
  cout << *p << endl;

  return 0;
}