2020-7-19 · 同阶的，也就是说实际上一次询问中红色的点对于整棵树来说是很稀疏的，所以如果我们能让复杂度由红色点的总数来决定就好了。 因此我们需要 浓缩信息，把一整颗大树浓缩成一颗小树 。 由此我们引出了 「虚树」 这个概念。 我们先直观地来看看虚树的样子。
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