Compilare: user.cpp: In function ‘void df(int)’: user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[x].size();++i) ^ user.cpp: In function ‘void make()’: user.cpp:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ord.size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:105:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ord.size();++i) ^