Borderou de evaluare (job #511555)

Eroare de compilare: user.cpp: In function 'int main()': user.cpp:10:4: error: reference to 'cin' is ambiguous user.cpp:5:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:11:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:22:4: error: reference to 'cout' is ambiguous user.cpp:6:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout user.cpp:24:5: error: reference to 'cout' is ambiguous user.cpp:6:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout