title: Why is the use of cin, cout or %I64d preferred over %lld specifier in C++?
body: <p>Why do many of the online judges advise <em>&quot;do not use the <code>%lld</code> specifier to read or write 64-bit integers in С++&quot;</em>?</p>
  <p>Is it preferred to use the <code>cin</code>, <code>cout</code> streams or the <code>%I64d</code> specifier?</p>