Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:16:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++)df(a[nod][i],k+1); ^ user.cpp: In function ‘int main()’: user.cpp:35:26: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 2 has type ‘int*’ [-Wformat=] scanf("%ld%ld",&x,&v[i]); ^