Compilare: main.cpp: In function 'int main()': main.cpp:8:24: warning: unused variable 'i' [-Wunused-variable] unsigned long long i , n , r , a , ca=a , p; ^ main.cpp:8:32: warning: unused variable 'r' [-Wunused-variable] unsigned long long i , n , r , a , ca=a , p; ^ main.cpp:8:43: warning: 'a' is used uninitialized in this function [-Wuninitialized] unsigned long long i , n , r , a , ca=a , p; ^