View Code of Problem 67

#include<bits/stdc++.h>
using namespace std;

int main() {

	int x1,x2,x3,x4,y1,y2,y3,y4;
	while(cin>>x1>>y1>>x2>>y2){
		cin>>x3>>y3>>x4>>y4;
		double k1=(x4-x3)*(y2-y1);
		double k2=(x2-x1)*(y4-y3);
		if(k1==k2){
			double k3=(y2-y1)*(x3-x2);
			double k4=(y3-y2)*(x2-x1);
			if(k3==k4){
				cout<<"No"<<endl;
			}else{
				cout<<"Yes"<<endl;
			}
		}else{
			cout<<"No"<<endl;
		}
	}
	
	return 0;
}