#include<iostream> using namespace std; int main() { double x1, x2, x3, x4, y1, y2, y3, y4; while (cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3 >> x4 >> y4) { double k1, k2; double b1, b2; if (x1 == x2) { k1 = 100000; b1 = x1; } else if (x1 != x2) { k1 = (y2 - y1) / (x2 - x1); b1 = y1 - k1 * x1; } if (x3 == x4) { k2 = 100000; b2 = x3; } else if (x3 != x4) { k2 = 1.0 * (y4 - y3) / (x4 - x3); b2 = y3 - k2 * x3; } if ((k1 == k2 && b1 == b2) || k1 != k2) { cout << "Yes" << endl; } else if (k1 == k2 && b1 != b2) { cout << "No" << endl; } } } |
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