title: How can I push_back data in a 2d vector of type int
body: <p>I have a vector and want to store int data in to it at run time can I store the data in a 2D vector in this manner ?</p>
  
  <pre><code>std::vector&lt;std::vector &lt;int&gt;&gt; normal:
      for(i=0;i&lt;10;i++){
          for(j=0;j&lt;20;j++){
              normal[i].push_back(j);
      }
  }
  </code></pre>