/in/foo.cc: In function 'bool check(std::__cxx11::string, std::__cxx11::string)':
/in/foo.cc:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for( int i = 0;i < p.size();i++)
                 ~~^~~~~~~~~~
/in/foo.cc:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for( int i = 0;i < s.size();i++)
                  ~~^~~~~~~~~~
/in/foo.cc:20:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(k == p.size()) return 1;
     ~~^~~~~~~~~~~