View Code of Problem 67

#include <iostream>
using namespace std;

int main() {
    int x1, x2, y1, y2, x3, x4, y3, y4;
    while(cin >> x1 >> y1 >> x2 >> y2){
        cin >> x3 >> y3 >> x4 >> y4;
        int k1 = (y2-y1) / (x2 - x1);
        int k2 = (y4-y3) / (x4 - x3);
        if(k1 != k2)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    return 0;
}

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