Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:13:16: error: variable ‘std::ifstream in’ has initializer but incomplete type ifstream in("teatru.in"); ^ user.cpp:14:17: error: variable ‘std::ofstream out’ has initializer but incomplete type ofstream out("teatru.in"); ^ user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.length(); i++) ^