/in/foo.cc: In function 'll f(ll, ll, ll)':
/in/foo.cc:8:14: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if (b&1==1) t=t*y%n;
              ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:16:26: error: 'mi' was not declared in this scope
  printf("%lld",mi(x,x-2,y));
                          ^