/in/foo.cc: In function 'bool search(std::__cxx11::string, std::__cxx11::string, int)':
/in/foo.cc:101:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (j<s.length() && i<s1.length())
         ~^~~~~~~~~~~
/in/foo.cc:101:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (j<s.length() && i<s1.length())
                         ~^~~~~~~~~~~~
/in/foo.cc:107:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (i<s1.length()) return false;
      ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:140:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(j=0; j<s1.length(); ++j)
             ~^~~~~~~~~~~~