Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:83: error: ‘stdin’ was not declared in this scope user.cpp:83: error: ‘freopen’ was not declared in this scope user.cpp:84: error: ‘stdout’ was not declared in this scope user.cpp:86: error: ‘scanf’ was not declared in this scope user.cpp:139: error: ‘printf’ was not declared in this scope