/in/foo.cc: In function 'int main()':
/in/foo.cc:7:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(t.find(s)!=-1)
     ~~~~~~~~~^~~~
/in/foo.cc:11:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  else if(s.find(t)!=-1)
          ~~~~~~~~~^~~~