#include<stdio.h> #include<math.h> main() { double x1,x2,x3,x4,y1,y2,y3,y4; double k1,k2; while(scanf("%f %f %f %f",&x1,&y1,&x2,&y2)!=EOF) { scanf("%d %d %d %d",&x3,&y3,&x4,&y4); if(abs(x1-x2)==0&&abs(x3-x4)==0) printf("No\n"); else if(abs(x1-x2)==0&&abs(x3-x4)!=0) printf("Yes\n"); else if(abs(x1-x2)!=0&&abs(x3-x4)==0) printf("Yes\n"); else { k1=abs(y2-y1)/abs(x1-x2)*1.0; k2=abs(y3-y4)/abs(x3-x4)*1.0; if(k1==k2)printf("No\n"); else printf("Yes\n"); } } } |
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