Borderou de evaluare (job #26096)

Compilare: user.cpp: In function ‘void back(int)’: user.cpp:32:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp: In function ‘int main()’: user.cpp:40:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:41:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]