Eroare de compilare: user.cpp:7:12: error: variable ‘std::ifstream in’ has initializer but incomplete type ifstream in("sortaret.in"); ^ user.cpp:8:13: error: variable ‘std::ofstream out’ has initializer but incomplete type ofstream out("sortaret.out"); ^ user.cpp: In function ‘void sortareTopologica(Digraf&)’: user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<D.a[u].size();i++) ^