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