/in/foo.cc: In function 'void check(std::__cxx11::string&)':
/in/foo.cc:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(i=0;i<record.size();i++){
                 ~^~~~~~~~~~~~~~
/in/foo.cc:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=i;j<record.size();j++){
                     ~^~~~~~~~~~~~~~