![[SPOJ-COT]Count on a tree 题解](https://ksmeow.moe/wp-content/uploads/2018/02/180226b-1-760x400.png)
[SPOJ-COT]Count on a tree 题解
题目地址：洛谷：【SP10628】COT – Count on a tree …
May all the beauty be blessed.
SPOJ
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