> the game director throws several plastic rings in the pool such that center of no ring lies inside any other ring
> 
> 但是我的程序里加上：
> for(i=0;i<n;i++)
> for(j=i+1;j<n;j++)
> if(distance(p[i],p[j])<max(p[i].r,p[j].r))while(1);
> 就由wA变成tle.

题目不是说一个圆的圆心，不会在另外一个圆内