Compilare: user.cpp: In function ‘int main()’: user.cpp:30:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<lista[i].size(); j++) ^ user.cpp: In function ‘void df(int)’: user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<lista[nod].size(); i++) ^