你拼错了。。。这应该是树的欧拉序。。
by ustze @ 2019-12-13 16:36:47
@[ustze](/user/27030) 他想表达的是欧拉旅游树 ETT 吧？
by mrsrz @ 2019-12-13 16:37:36
@[mrsrz](/user/6813) /jk 好像是的
by ustze @ 2019-12-13 16:38:49
[算法不觉，$oiwiki$](https://oi-wiki.org/ds/ett/)
by MikukuOvO @ 2019-12-13 16:52:12
@[行吟啸九州](/user/163980) https://www.luogu.com.cn/problem/CF1053E
by cszmc2004 @ 2019-12-13 17:06:19