Compilare: user.c: In function ‘main’: user.c:9: warning: format ‘%lld’ expects type ‘long long int’, but argument 2 has type ‘int’ user.c:35: warning: format ‘%lld’ expects type ‘long long int’, but argument 2 has type ‘int’ user.c:5: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:6: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result user.c:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result