Compilare: user.c: In function ‘main’: user.c:60: warning: implicit declaration of function ‘time’ user.c:55: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:56: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:58: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:64: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result