title: How to printf std::vector<>::size_type?
body: <p><code>std::vector</code> has a member type <code>size_type</code>. What is its printf format specifier?</p>
  <p>Note that <code>size_type</code> is not identical to <code>size_t</code>.<br>
  <a href="https://en.cppreference.com/w/cpp/container/vector" rel="nofollow noreferrer">https://en.cppreference.com/w/cpp/container/vector</a><br>
  <a href="https://en.cppreference.com/w/cpp/types/size_t" rel="nofollow noreferrer">https://en.cppreference.com/w/cpp/types/size_t</a><br>
  <a href="https://en.cppreference.com/w/cpp/io/c/fprintf" rel="nofollow noreferrer">https://en.cppreference.com/w/cpp/io/c/fprintf</a><br></p>