#include<stdio.h> #include<math.h> int main(){ int k1,k2; int x[4]={0},y[4]={0}; while(scanf("%d%d%d%d",&x[0],&y[0],&x[1],&y[1])!=EOF) { k1=k2=0; scanf("%d%d%d%d",&x[2],&y[2],&x[3],&y[3]); if(x[0]==x[1] && x[2]==x[3]) { if (x[0]==x[2]) printf("Yes\n"); else printf("No\n"); } else if(x[0]!=x[1] ||x[2]!=x[3]) printf("Yes\n"); else { k1=(y[0]-y[1])/(x[0]-x[1]); k2=(y[2]-y[3])/(x[2]-x[3]); if(k1==k2) printf("No\n"); else printf("Yes\n"); } } return 0; } |
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