push_back problem on vector<vector<int> >
<p>Dear All,<br>
I used a vector of vector, say <code>vector&lt;vector&lt;int&gt; &gt; no_1_2</code> to store elements of two <code>vector&lt;int&gt;</code> containers, say no1 &amp; no2. so for e.g. i would say, no1={2,5,7,10,3} and no2={21,34,15}.  </p>

<p>I wanted to store these 2 vectors in one container called no_1_2 and I used <code>no_1_2[0].push_back(no1.at(i))</code> and <code>no_1_2[1].push_back(no2.at(j))</code> within two 'for' loops. But, i got error. is there anyway to solve this?  </p>

<p>Can't i push_back vector of vector? any help please..
thanks</p>

<p>sorry here is part of my code,
//some classes and some codes are here</p>

<pre><code>vector&lt; vector&lt;int&gt; &gt; final_list(int code1,int code2){
   vector&lt;vector&lt;int&gt; &gt; no_1_2;
   vector&lt;int&gt; in;
   vector&lt;int&gt; out;
   for (int foo=0;foo&lt;size();foo++){
       int a_point=foo;
       if (at(a_point).Code()==code1){
           vector&lt;int&gt; closer_points;
           closer_points=at(foo).Closers();
           for (int fee=0;fee&lt;closer_points.size();fee++){
               int a_neb_point=closer_points.at(fee);
               if (at(a_neb_point).Code()==code2){
                    in.push_back(a_point);  
                    out.push_back(a_neb_point);  
                    }
               }
           }
       }
   /remove duplicates // above in and out vectors containing some values repeatedly, so, i remove the duplicates here
   for(vector&lt;int&gt;::iterator i=in.begin();i!=in.end();i++){
     sort(in.begin(),in.end());
     in.erase(unique(in.begin(),in.end()),in.end()); 
     no_1_2[0].push_back(*i);
     }
   for(vector&lt;int&gt;::iterator o=out.begin();o!=out.end();o++){
     sort(out.begin(),out.end());
     out.erase(unique(out.begin(),out.end()),out.end());
     no_1_2[1].push_back(*o);
     }
   return no_1_2;
   }

int main (){
// some code

vector&lt; vector &lt;int&gt; &gt; in_out=mylist.final_list(34,1); //here i just tried for code    values for (34, 1), like that i have many sets
}
</code></pre>
