title: C++ iterator to last element of a set
body: <p>I have the following code in C++</p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;set&gt;
  
  using namespace std;
  
  int main()
  {
      set&lt;int&gt; a;
      int n;
  
      for(int i=0;i&lt;3;i++){
        cin&gt;&gt;n;
        a.insert(n);
      }
  
      cout &lt;&lt; *a.end();
      return 0;
  }
  </code></pre>
  
  <p>Why is it always printing "3" instead of the greatest element in the set? Replacing <code>cout &lt;&lt; *a.end();</code> with <code>cout &lt;&lt; *--a.end();</code> works fine.</p>