逝者如斯夫，不舍昼夜

题意：Jony要写n篇博客，每篇博客的内容只能覆盖一个主题，但一个主题可以被多篇博客覆盖。在博客与博客之间可以相互引用，但是相互引用的博客不能涵盖相同的主题，否则博客是无效的。给出Jony要写的博客之间的相互引用关系，他在写博客的时候会依照这个引用关系来安排写博客的顺序，因此他在写博客的时候会首先查看他要引用的博客的主题，然后选出没有被覆盖的且主题编号最小的主题写入本篇博客。例如：若要的这篇博客引用的博客覆盖了主题1，3，2，5，那么这篇博客就应该要选择主题4编写。问是否存在一个写博客的顺序满足博客之间的相

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