Compilare: user.cpp: In function ‘void biti()’: user.cpp:44:20: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 2 has type ‘int’ [-Wformat=] printf("%llu\n", s); ^ user.cpp: In function ‘int main()’: user.cpp:49:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum.in", "r", stdin); ^ user.cpp:50:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum.out", "w", stdout); ^ user.cpp:51:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%zd", &a); ^ user.cpp:54:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%zd", &n); ^