#include<iostream>#include<stdio.h>#include<math.h>#define eps 1e-8using namespace std;struct point{double x,y;};struct line{point a,b;};point a1,a2,a3,a;double xmult(point p1,point p2,point p0){ return (p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y);}point intersection(line u,line v){ point ret=u.a; double t=((u.a.x-v.a.x)*(v.a.y-v.b.y)-(u.a.y-v.a.y)*(v.a.x-v.b.x)) /((u.a.x-u.b.x)*(v.a.y-v.b.y)-(u.a.y-u.b.y)*(v.a.x-v.b.x)); ret.x+=(u.b.x-u.a.x)*t; ret.y+=(u.b.y-u.a.y)*t; return ret;}point circumcenter(point a,point b,point c){ line u,v; u.a.x=(a.x+b.x)/2; u.a.y=(a.y+b.y)/2; u.b.x=u.a.x-a.y+b.y; u.b.y=u.a.y+a.x-b.x; v.a.x=(a.x+c.x)/2; v.a.y=(a.y+c.y)/2; v.b.x=v.a.x-a.y+c.y; v.b.y=v.a.y+a.x-c.x; return intersection(u,v);}double dog1(double a,double b,double c){ double max; if (a>b) max=a; else max=b; if (max<c) max=c; return max;}double dog2(double a,double b,double c){ double min; if (a<b) min=a; else min=b; if (min>c) min=c; return min;}bool pig(point p){ double t1,t2; t1=(xmult(a1,a3,a2)); t2=(xmult(a1,p,a2)); if ((t1<0&&t2<0)||(t1>0&&t2>0)) return true; return false;}int main(){ double maxx,maxy,minx,miny,r; point p1; int px,py; scanf("%lf%lf%lf%lf%lf%lf",&a1.x,&a1.y,&a2.x,&a2.y,&a3.x,&a3.y); a=circumcenter(a1,a2,a3); r=sqrt(0.0+(a1.x-a.x)*(a1.x-a.x)+(a1.y-a.y)*(a1.y-a.y)); maxx=dog1(a1.x,a2.x,a3.x); maxy=dog1(a1.y,a2.y,a3.y); minx=dog2(a1.x,a2.x,a3.x); miny=dog2(a1.y,a2.y,a3.y); p1.x=a.x-r; p1.y=a.y; if (pig(p1)) minx=p1.x; p1.x=a.x+r; if (pig(p1)) maxx=p1.x; p1.x=a.x; p1.y=a.y-r; if (pig(p1)) miny=p1.y; p1.y=a.y+r; if (pig(p1)) maxy=p1.y; px=(long)ceil(maxx-eps)-(long)floor(minx+eps); py=(long)ceil(maxy-eps)-(long)floor(miny+eps); printf("%dn",px*py); cin>>r; return 0;}
