10.27

#include<stdio.h>

#define PI 3.1415926

int main()

{

/*int a,b;

scanf("%d %d",&a,&b);

a=a+b;

b=a-b;

a=a-b;

printf("A=%d,B=%d",a,b);*/

/* double a;

scanf("%lf",&a);

printf("%.2f",PI*a/180);*/

/* int x1,x2,y1,y2;

scanf("%d%d%d%d",&x1,&y1,&x2,&y2);

printf("%.2f %.2f",1.0*(x1+x2)/2,1.0*(y1+y2)/2);*/

int x1,x2,y1,y2,a,b,c,d;

scanf("%d%d%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&a,&b,&c,&d);

((y2-y1)*a+(x1-x2)*b<(x1*y2-y1*x2)&&(y2-y1)*c+(x1-x2)*d<(x1*y2-y1*x2)||(y2-y1)*a+(x1-x2)*b>(x1*y2-y1*x2)&&(y2-y1)*c+(x1-x2)*d>(x1*y2-y1*x2))?printf("YES"): printf("NO");

return 0;

}