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