Borderou de evaluare (job #14731)

Compilare: user.cpp: In function 'void back(int)': user.cpp:27:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] user.cpp: In function 'int main()': user.cpp:35:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:36:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] user.cpp:37:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]