Borderou de evaluare (job #490855)

Eroare de compilare: user.cpp:4:13: error: variable 'std::ifstream cin' has initializer but incomplete type user.cpp:5:14: error: variable 'std::ofstream cout' has initializer but incomplete type user.cpp: In function 'int main()': user.cpp:10:5: error: reference to 'cin' is ambiguous user.cpp:4:10: error: candidates are: <typeprefixerror>cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:11:5: error: reference to 'cin' is ambiguous user.cpp:4:10: error: candidates are: <typeprefixerror>cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:12:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:58:29: error: reference to 'cout' is ambiguous user.cpp:5:10: error: candidates are: <typeprefixerror>cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout