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 #### [$P3047$ $Nearby$ $Cows$ $G$](https://www.luogu.com.cn/problem/P3047)

-https://www.cnblogs.com/wzx-RS-STHN/p/13414401.html
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 **题目大意**
 题目大意是给你一颗树，对于每一个节点$i$，求出范围$k$之内的点权之和。