/in/foo.cc: In function 'int main()':
/in/foo.cc:55:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(register int i = 1; i <= n; i++)
                          ~~^~~~
/in/foo.cc:64:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(register int i = n; i > n - m + 1; i--)
                          ~~^~~~~~~~~~~
/in/foo.cc:75:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(que.front() == h[i+m-1]) que.pop();
      ~~~~~~~~~~~~^~~~~~~~~~~
/in/foo.cc:77:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(register int i = 1; i <= n - m + 1; i++)
                          ~~^~~~~~~~~~~~