View Code of Problem 67

#include<iostream>
using namespace std;
int main(){
	double x1,y1,x2,y2,x3,y3,x4,y4,k1,k2,b1,b2;
	
	while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4){
		if(x1==x2&&x3==x4){
			if(x1==x3){
				cout<<"Yes"<<endl;
			}
			else{
				cout<<"No"<<endl;
			}
		} else{
		k1=(y2-y1)/(x2-x1);
		k2=(y4-y3)/(x4-x3);
		b1=y1-k1*x1;
		b2=y3-k2*x3;
		if(k1==k2&&b1!=b2){
			cout<<"No"<<endl;
		}else{
			cout<<"Yes"<<endl;
		}
			
		}
		
	}
	return 0;
}