#include<bits/stdc++.h> using namespace std; typedef long long ll; int main (){ double x1, y1, x2, y2, x3, y3, x4, y4; while(~scanf("%lf%lf%lf%lf", &x1, &y1, &x2, &y2)){ scanf("%lf%lf%lf%lf", &x3, &y3, &x4, &y4); if(x1!=x2&&x3!=x4){ double k1 = (y2-y1)/(x2-x1); double k2 = (y4-y3)/(x4-x3); if(k1!=k2){ printf("Yes\n"); }else if(y1-k1*x1!=y3-k2*x3){ printf("No\n"); }else{ printf("Yes\n"); } }else if(x1==x2&&x3==x4&&x1!=x3){ printf("No\n"); }else{ printf("Yes\n"); } } return 0; } |
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