洛谷博客：https://www.luogu.com.cn/blog/Starlight237/post-gui-ze-lei-guai-tan-er-zhong-xiao-yuan-zhi-ying

知乎文章：https://zhuanlan.zhihu.com/p/448679346

知乎回答：https://www.zhihu.com/question/501651078/answer/2281991190

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