#include "stdio.h" void main() { int x1,y1,x2,y2,x3,y3,x4,y4; double k1,k2; for(;scanf("%d%d%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF;) { if(x1!=x2&x3!=x4) { k1=(y1-y2)/(x1-x2)*1.00; k2=(y3-y4)/(x3-x4)*1.00; if(k1==k2) printf("No\n"); else printf("Yes\n"); } else printf("Yes\n"); //printf("%.2lf %.2lf",k1,k2); } } |
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