Eroare de compilare: user.cpp: In function ‘void bf(const int&, const int&)’: user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:30: error: ‘stdin’ was not declared in this scope user.cpp:30: error: ‘freopen’ was not declared in this scope user.cpp:31: error: ‘stdout’ was not declared in this scope