Borderou de evaluare (job #482597)

Eroare de compilare: user.cpp: In function 'int main()': user.cpp:9:18: error: variable 'std::ifstream cin' has initializer but incomplete type user.cpp:10:18: error: variable 'std::ofstream cout' has initializer but incomplete type user.cpp:9:14: warning: unused variable 'cin' [-Wunused-variable] user.cpp:10:14: warning: unused variable 'cout' [-Wunused-variable] user.cpp:11:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:12:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:13:12: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:18:16: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]