/in/foo.cc: In function 'bool ip(long long int)':
/in/foo.cc:7:10: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(x%400==0&x%100==0||x%4==0&x%100!=0) 
     ~~~~~^~~
/in/foo.cc:7:27: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(x%400==0&x%100==0||x%4==0&x%100!=0) 
                        ~~~^~~