#include "stdio.h" void main() { double x1,y1,x2,y2,x3,y3,x4,y4; for(;scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF;) { if(x1!=x2&&x3!=x4) { if((y3-y4)/(x3-x4)==(y1-y2)/(x1-x2)) //斜率 { if(y1-x1*((y1-y2)/(x1-x2))==y3-x3*((y3-y4)/(x3-x4))) //b1与b2:重合? printf("Yes\n"); else printf("No\n"); } else printf("Yes\n"); } else if((x1==x2&&x3==x4)) //分母0 { if(x1==x3) printf("Yes\n"); else printf("No\n"); } else printf("Yes\n"); //printf("%.2lf %.2lf",k1,k2); } } |
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