Compilare: main.cpp: In function 'void df(int)': main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[nod].size(); j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~