#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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