Compilare: main.cpp: In function 'int phi(long long int)': main.cpp:53:23: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'long long int' [-Wsign-compare] 53 | for (i = 2; i * i <= n; i++) | ~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:71:21: warning: unused variable 'pow' [-Wunused-variable] 71 | long long A, N, pow, x; | ^~~ main.cpp:71:26: warning: unused variable 'x' [-Wunused-variable] 71 | long long A, N, pow, x; | ^