View Code of Problem 67

#include<iostream>
using namespace std;
int main(){
	int x1,y1,x2,y2,x3,y3,x4,y4;
	while(cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4){
		double k1=(double)(y2-y1)/(x2-x1);
		double k2=(double)(y4-y3)/(x4-x3);
		if(k1==k2 || (x1==x2 &&x3==x4)){
			printf("No");
			cout<<"\n";
		}
		else{
			printf("Yes");
			cout<<"\n";
		}
	}
}