nodchip https://blog.hatena.ne.jp/nodchip/ nodchipの日記 https://nodchip.hatenadiary.org/ 幾何 接する点を固定してベクトルの足し算と引き算 typedef complex<double> P; void go(const P& a, const P& b, const P& c, const P& d) { if (abs(a - c) > EPS) { return; } assert(abs(a - d) > EPS); assert(abs(b - c) > EPS); assert(abs(b - d) > EPS); P p = b - a + d; printf("%.03f %.03f\n", p.real(), p.imag()); } int main() { f… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnodchip.hatenadiary.org%2Fentry%2F20100524%2F1274699367" title="PKU 2624 4th Point - nodchipの日記" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2010-05-24 20:09:27 rich https://nodchip.hatenadiary.org/entry/20100524/1274699367 1.0 100%