#include<stdio.h> #include<math.h> int main(){ double x1,y1,x2,y2,x3,y3,x4,y4; double k1,k2,b1,b2; while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF){ k1=(y2-y1)/(x2-x1);//算出两条直线的斜率 k2=(y4-y3)/(x4-x3); b1=y1-k1*x1;//算出两条直线的常数 b2=y3-k2*x2; if(x1==x2&&x3==x4) { if(x1==x3) printf("Yes\n"); else printf("No\n"); } if(k1==k2){ if(b1!=b2){ printf("No\n");//pingxing }else{ printf("Yes\n");//xiangjiao } }else{ printf("Yes\n"); } } return 0; } |
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