Borderou de evaluare (job #299364)

Eroare de compilare: user.cpp:4:14: error: variable 'std::ifstream cin' has initializer but incomplete type user.cpp:5:14: error: expected constructor, destructor, or type conversion before '(' token user.cpp: In function 'int main()': user.cpp:9:5: 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:12:7: 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:17:9: 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