title: go through map c++
body: <p>So, I have an <code>std::map&lt;int, my_vector&gt;</code> and I want to go through each int and analyse the vector.
  I haven't gotten to the part of analyzing the vector just yet, I'm still trying to figure out how to go through every single element on the map.
  I know it is possible to have an iterator, but I didn't quite understood how it works, also, I don't know if there isn't a better way to do what I intend to do</p>