Borderou de evaluare (job #501052)

Eroare de compilare: user.cpp: In function 'int main(int, const char**)': user.cpp:34:5: error: reference to 'cin' is ambiguous user.cpp:16:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:35:36: error: reference to 'cin' is ambiguous user.cpp:16:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:45:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:46:9: error: reference to 'cout' is ambiguous user.cpp:17:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout user.cpp:50:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:54:17: error: reference to 'cout' is ambiguous user.cpp:17:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout user.cpp:65:5: error: reference to 'cout' is ambiguous user.cpp:17:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout