Compilare: user.c: In function ‘main’: user.c:53: warning: format ‘%lld’ expects type ‘long long int *’, but argument 3 has type ‘long long int’ user.c:51: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:53: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:53: warning: ‘nr’ may be used uninitialized in this function