Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:16:35: 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:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[X].size();++i) dfs(V[X][i].first,X); ^