title: Serilize List<List<string>> in ProtoBuf-net and Deserialize as a C++ vector<vector<string>>
body: <p>I have a list of list objects in C#</p>
  
  <pre><code>List&lt;List&lt;string&gt;&gt; matrix = new List&lt;List&lt;string&gt;&gt;();
  </code></pre>
  
  <p><strong>NOTE: number elements in the lists changes at runtime</strong>
  which I want to Serialize using protobuf</p>
  
  <p>And later I need to Deserialize data using <code>protocolBuffer</code> in C++ as a <code>vector&lt;vector&lt;string&gt;&gt;</code></p>
  
  <p>Can this be done? Wondering how to define .proto file?</p>