/in/foo.cc: In function 'int main()':
/in/foo.cc:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (q.size()>=cnt)cnt=q.size();
       ~~~~~~~~^~~~~
/in/foo.cc:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (q.size()>=cnt)cnt=q.size();
        ~~~~~~~~^~~~~
/in/foo.cc:26:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (q.size()>=cnt)cnt=q.size();
        ~~~~~~~~^~~~~
/in/foo.cc:33:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (q.size()>=cnt)cnt=q.size();
        ~~~~~~~~^~~~~
/in/foo.cc:36:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (q.size()>=cnt)cnt=q.size();
      ~~~~~~~~^~~~~