/in/foo.cc: In function 'int main()':
/in/foo.cc:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (q.size()>=cnt)cnt=q.size();
        ~~~~~~~~^~~~~
/in/foo.cc:35:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (q.size()>=cnt)cnt=q.size();
      ~~~~~~~~^~~~~