hdu 4720 Naive and Silly Muggles 外接圆(计算几何) 2013 ACM/ICPC Asia Regional Online —— Warmup2 1005
#include
#include
#include
#include
#include
usingnamespacestd;
constdoubleeps=1e-14;
doublex,y,r,rr;
doublecross(doublex1,doubley1,doublex2,doubley2)
{
returnsqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}