/in/foo.cc: In function 'void supply(Line, Line&)':
/in/foo.cc:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(info2.music.size()==info2.ranking) return;
        ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:109:60: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'std::__cxx11::string* {aka std::__cxx11::basic_string<char>*}' [-Wformat=]
    printf("%d %s\n",rankMusic[i].ranking,rankMusic[i].music);
                                                            ^