Compilare: user.cpp: In function ‘void dfs()’: user.cpp:29:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(b[nod]<v[nod].size()) ^ user.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[nod]==v[nod].size()) ^ user.cpp: In function ‘int main()’: user.cpp:73:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=z[i]+1;j<=v[i].size();j++) ^