Eroare de compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<A[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:28:5: error: ‘cin’ was not declared in this scope cin>>n>>m>>x>>y; ^ user.cpp:40:5: error: ‘cout’ was not declared in this scope cout<<viz[y]<<"\n"; ^