Compilare: user.c: In function ‘main’: user.c:35:3: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(out, "%d", 1LL * b * x % MOD * x % MOD * ptr(n + 1, MOD - 2) % MOD); ^ user.c:28:10: warning: unused variable ‘i’ [-Wunused-variable] int n, i; ^ user.c:29:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^