相关链接
题目传送门：https://www.codechef.com/MARCH16/problems/PARITREE
神犇题解：http://r64.is-programmer.com/posts/197030.html
解题报告
这题大概是PA2014 Kuglarz的升级版
我们发现其给定树上一条路径的奇偶性，实际上可以理解为给定路径上两个端点到根的路径的奇偶性的关系
换一句话来说，这两个的奇偶性定了一个，另一个也就确定了
所以给定$u,v$的奇偶性，就用并查集把这两货连一起
最后假设有$k$个连通块，那答案就是$2^k$
当然我们还需要特判一下无解的情况，在并查集那里多记录一点东西就可以了
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