Compilare: user.c: In function ‘main’: user.c:28: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’ user.c:12: warning: unused variable ‘j’ user.c:14: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:16: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result