Compilare: user.cpp: In function ‘int main()’: user.cpp:10:28: warning: unused variable ‘i’ [-Wunused-variable] unsigned long long a,b,i,k,p=1; ^ user.cpp:10:30: warning: unused variable ‘k’ [-Wunused-variable] unsigned long long a,b,i,k,p=1; ^ user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.in", "r", stdin); ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lgput.out", "w", stdout); ^ user.cpp:11:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld",&a,&b); ^