Compilare: user.c: In function ‘main’: user.c:80: warning: unused variable ‘j’ user.c:81: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:82: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:83: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:87: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:90: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result user.c:96: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result