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){
		int  k1=(y2-y1)*(x4-x3);
		int  k2= (y4-y3)*(x2-x1);
		int  k3=(y4-y1)*(x2-x3);
		int  k4=(y2-y3)*(x4-x1);
		if(k1==k2 && k3!=k4){
			printf("No");
			printf("\n");
		}
		else{
			printf("Yes");
			printf("\n");
		}
	}
}