View Code of Problem 67

#include <bits/stdc++.h>
using namespace std;
int a[1000][1000];
int main() 
{
	int x1,y1,x2,y2;
	int x3,y3,x4,y4;
	while(cin>>x1>>y1>>x2>>y2) {
		cin>>x3>>y3>>x4>>y4;
		int a1,b1,a2,b2;
		a1 = (x1-x2)*(y3-y4);
		a2 = (x3-x4)*(y1-y2);
		//判断两条直线是否重合
		b1=(y3-y1)*(x2-x1);
        b2=(x3-x1)*(y2-y1);
		if(a1==a2&&b1!=b2)
			cout<<"No"<<endl;
		else 
			cout<<"Yes"<<endl;
	}
	
	
	return 0;
 }