#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) { double s1,s2; if(x1!=x2&&x4!=x3) { s1=(y2-y1)/(x2-x1); s2=(y4-y3)/(x4-x3); if(s1==s2) printf("NO\n"); else printf("YES\n"); } else { if(x2==x1&&3==x4) printf("NO\n"); else printf("YES\n"); } } return 0; } |
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