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    <p>It is not much clear, but I guess you want an automatic resize container (as javascript vectors) where lists indexes are 1 based (i.e. no list at address 0) and a method to insert at the end of one list at a given index. Basically something as this:</p> <pre><code>struct MyCollection: public std::vector&lt;std::list&lt;std::string&gt; &gt; { void push_at(size_t index, const std::string&amp; item) { resize(std::max(size(),index - 1); at(index - 1).push_back(item); } }; </code></pre> <p>Anything else you might want from such container is likely to be already implemented in the <code>vector</code> and <code>list</code> template classes (check stl documentation to see whats available), for example:</p> <pre><code>MyCollection a; //declares an empty collection a.push_at(6,"hello"); //create 6 lists and inserts "hello" at the end of the last one a[5]; //gets 6th list (method [] is 0-based on vector) a.push_at(6,"hi"); // since list already exists it just adds "hi" at the end a[5].front() //"hello" a[5].back() //"hi" </code></pre> <p>Other suggestions:</p> <ul> <li>if you plan to put a lot of items in there and do not need to have all lists object at consecutive addresses (i.e. compatibility of vector with C arrays), I suggest you use a <code>deque</code> instead of a <code>vector</code>, or provide a proper size hint with <code>reserve</code>, otherwise you might be find yourself wondering why sometimes adding a single string in a list that does not exists yet is so slow.</li> <li>STL uses 0-based indexes all around. You will only get confused by defining a 1-based one, so count your lists from 0 (just replace <code>index - 1</code> with <code>index</code> in the example above) and do your math on application logic)</li> </ul>
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