Compilare: user.cpp: In function ‘int main()’: user.cpp:11:27: warning: unused variable ‘m’ [-Wunused-variable] unsigned long long n, m, i, j, s, t, d, k; ^ user.cpp:11:36: warning: unused variable ‘s’ [-Wunused-variable] unsigned long long n, m, i, j, s, t, d, k; ^ user.cpp:11:39: warning: unused variable ‘t’ [-Wunused-variable] unsigned long long n, m, i, j, s, t, d, k; ^ user.cpp:11:42: warning: unused variable ‘d’ [-Wunused-variable] unsigned long long n, m, i, j, s, t, d, k; ^ user.cpp:8:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pba.in","r",stdin); ^ user.cpp:9:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pba.out","w",stdout); ^ user.cpp:13:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu",&n); ^ user.cpp:15:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llu",&k); ^