U141817 UVA122 树的层次遍历 Trees on the level
题目描述
[UVA122](https://www.luogu.com.cn/problem/UVA122)
输入格式
[UVA122](https://www.luogu.com.cn/problem/UVA122)
输出格式
[UVA122](https://www.luogu.com.cn/problem/UVA122)
说明/提示
[UVA122](https://www.luogu.com.cn/problem/UVA122)