/in/foo.cc: In function 'int quick_pow(int, int)':
/in/foo.cc:10:12: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   if(b & 1 != 0){
          ~~^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:20: warning: unused variable 'res' [-Wunused-variable]
  int n , m , ans , res;
                    ^~~