#include<string> #include<iostream> #include<algorithm> 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 f1 = (y1 - y2)*(x3 - x4); int f2 = (x1 - x2)*(y3 - y4); int f3 = (y1 - y4)*(x3 - x2); int f4 = (y3 - y2)*(x1 - x4); if (f1==f2&&f3!=f4) { cout << "No" << endl; } else { cout << "Yes" << endl; } } return 0; } |
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