Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<V[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:65:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^