Borderou de evaluare (job #519779)

Eroare de compilare: user.cpp: In function 'int main()': user.cpp:10:2: error: reference to 'cin' is ambiguous user.cpp:3:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:11:2: error: reference to 'cin' is ambiguous user.cpp:3:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:30:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:43:2: error: reference to 'cout' is ambiguous user.cpp:4:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout