View Code of Problem 67

#include<iostream>
#include<cstring>
#include<string>
#include<algorithm>
#include<vector>
using namespace std;


int main()
{
	int x1, y1, x2, y2;
	int x3, y3, x4, y4;
	while (cin >> x1 >> y1 >> x2 >> y2) {
		cin >> x3 >> y3 >> x4 >> y4;
		if (x1 == x2 && x3 == x4) {
			cout << "No" << "\n";
		}
		else if ((y2-y1)/(x2-x1)==(y4-y3)/(x4-x3)) {
			cout << "No" << "\n";
		}
		else {
			cout << "Yes" << "\n";
		}
	}
	return 0;
}