Borderou de evaluare (job #4609)

Compilare: user.c: In function ‘main’: user.c:9:31: warning: variable ‘cn’ set but not used [-Wunused-but-set-variable] user.c:7:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:8:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] user.c:11:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]