Compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i<= t ; i ++) ^ user.cpp:11:28: warning: unused variable ‘r’ [-Wunused-variable] unsigned long long n , r = 1, v , x , a , k, t; ^ user.cpp:11:44: warning: unused variable ‘a’ [-Wunused-variable] unsigned long long n , r = 1, v , x , a , k, t; ^ user.cpp:11:48: warning: unused variable ‘k’ [-Wunused-variable] unsigned long long n , r = 1, v , x , a , k, t; ^