Compilare: user.c: In function ‘main’: user.c:23:17: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 4 has type ‘int’ [-Wformat=] fprintf(out, "%lld %lld %lld\n", k + 1, -1, -k); ^ user.c:27:17: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 5 has type ‘int’ [-Wformat=] fprintf(out, "%lld %lld %lld\n", k + 1, -k, 0); ^ user.c:19:3: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%*c", &n); ^