#include <iostream> #include <cstdio> using namespace std; int main(){ int x1,y1,x2,y2,x3,y3,x4,y4,k1,k2; while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4){ k1=(y2-y1)/(x2-x1); k2=(y4-y3)/(x4-x3); if(k1%k2==0||k1==k2) cout<<"No"<<endl; else cout<<"Yes"<<endl; } return 0; } |
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