#include<stdio.h> int main(){ int x1,y1,x2,y2,x3,y3,x4,y4; double k1,k2,b1,b2; while(scanf("%d %d %d %d\n%d %d %d %d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF){ int differ_1=x2-x1; int differ_2=x4-x3; if(differ_1==0&&differ_2==0){ if(x1!=x3){ printf("No\n"); } else{ printf("Yes"); } } else{ if(differ_1==0||differ_2==0){ printf("Yes\n"); } else{ k1=1.0*(y2-y1)/(x2-x1); k2=1.0*(y4-y3)/(x4-x3); b1=y1-k1*x1; b2=y3-k2*x3; if(k1==k2&&b1!=b2){ printf("No\n"); } else{ printf("Yes\n"); } } } } return 0; } |
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