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