Eroare de compilare: user.cpp: In function ‘int bfs()’: user.cpp:28:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[curr_node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:47:2: error: ‘cin’ was not declared in this scope cin >> t; ^ user.cpp:61:4: error: ‘cout’ was not declared in this scope cout << "Nu" << "\n"; ^ user.cpp:64:4: error: ‘cout’ was not declared in this scope cout << "Da" << "\n"; ^