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几个要注意的地方1.题目虽然既给了点数也给了边数，但实际上边数永远是点数-1，也就是这始终是一棵树。 2.这是一颗无根树，边也都是无向边 3.那个什么nightmare的数据格式完全是坑人的，最后那个表示方向的字符无视掉就好 Followed by:
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