Compilare: user.c: In function ‘main’: user.c:40:5: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 2 has type ‘long long unsigned int’ [-Wformat=] printf("%I64u" , t); ^ user.c:31:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ndiv.in" , "r" , stdin); ^ user.c:32:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%u %u" , &a , &b); ^ user.c:39:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("ndiv.out" , "w" , stdout); ^