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