/in/foo.cc: In function 'int main()':
/in/foo.cc:31:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ans+=abs(a[n+1>>1].x-a[i].x)+abs(a[n+1>>1].y-a[i].y);
             ~^~
/in/foo.cc:31:38: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ans+=abs(a[n+1>>1].x-a[i].x)+abs(a[n+1>>1].y-a[i].y);
                                     ~^~