Compilare: main.cpp: In function 'int main()': main.cpp:12:12: warning: unused variable 'j' [-Wunused-variable] int i, j; ^ main.cpp:13:11: warning: unused variable 'f' [-Wunused-variable] FILE *f = freopen ("taste.in", "r", stdin); ^ main.cpp:14:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lli %lli",&x, &y); ^