Compilare: main.cpp:20:5: warning: first argument of 'int main(long long int, const char**)' should be 'int' [-Wmain] int main(ll argc, char const *argv[]) ^~~~ main.cpp: In function 'int main(long long int, const char**)': main.cpp:27:5: warning: variable 'a' set but not used [-Wunused-but-set-variable] ll a, b, val, x, y; ^ main.cpp:27:8: warning: variable 'b' set but not used [-Wunused-but-set-variable] ll a, b, val, x, y; ^ main.cpp:42:5: warning: unused variable 'ok' [-Wunused-variable] ll ok = 0; ^~