title: using the vector class
body: <p>I'm still learning the vector class and I want to know why I can't </p>
  
  <pre><code>void displace(unsigned int place)
  {
  
      stack.erase(place);
      distances.erase(place);
  
  }
  </code></pre>
  
  <p>I'm being told I need an iterator.  What can an iterator do that an int can't?</p>