UVA10917 Walk Through the Forest

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=21&page=show_problem&problem=1858 [PDF](https://uva.onlinejudge.org/external/109/p10917.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10917/2cdbcbd2041975ba19703cf570f7a4087f3eb461.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10917/022b71bb9cb1ef7722eafa8c8a774ab2ecc38148.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10917/b53d3ce908136ede18b278727a3e9aeb6d23bbaf.png)