#include <stdio.h> #include <stdlib.h> int main() { float x1,x2,x3,x4,y1,y2,y3,y4; while(scanf("%f %f %f %f",&x1,&y1,&x2,&y2) != EOF){ scanf("%f %f %f %f",&x3,&y3,&x4,&y4); float k1,k2,b1,b2; if(x1 == x2 && x3== x4&& x1 != x3){ printf("No\n"); } else if(x1 != x2 && x3 != x4){ 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"); } } else{ printf("Yes\n"); } } return 0; } |
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