UVA12824 Giving directions to the tree

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=861&page=show_problem&problem=4689 [PDF](https://uva.onlinejudge.org/external/128/p12824.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12824/d40d113b22f1b14be5454c714fb53ec931bfc639.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12824/526e416f46a21974ceefbaaa163917fa04e3f8e6.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12824/c3b2c4cf395f8ebf938335c11dbfb7f43c90f5e4.png)