View Code of Problem 67

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