Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:37:11: error: ‘n’ was not declared in this scope in >> n >> m; ^ user.cpp:37:16: error: ‘m’ was not declared in this scope in >> n >> m; ^ user.cpp:41:14: error: ‘class std::unordered_set<int>’ has no member named ‘push_back’ a[x].push_back(y); ^ user.cpp:42:14: error: ‘class std::unordered_set<int>’ has no member named ‘push_back’ a[y].push_back(x); ^ user.cpp:57:17: error: ‘cout’ was not declared in this scope cout << "YES\n"; ^ user.cpp:60:17: error: ‘cout’ was not declared in this scope cout << "NO\n"; ^