Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:43: error: ‘stdin’ was not declared in this scope user.cpp:43: error: ‘freopen’ was not declared in this scope user.cpp:44: error: ‘stdout’ was not declared in this scope user.cpp:46: error: ‘scanf’ was not declared in this scope user.cpp:51: error: ‘fgets’ was not declared in this scope user.cpp:52: error: ‘strlen’ was not declared in this scope user.cpp:67: error: ‘sort’ was not declared in this scope user.cpp:80: error: ‘lower_bound’ was not declared in this scope user.cpp:99: error: ‘printf’ was not declared in this scope