UVA841 Snake

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=782 [PDF](https://uva.onlinejudge.org/external/8/p841.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA841/032575877b2771737b11aa018b3d749e84ab1ecb.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA841/2034f24fde71884062eebb5fee89201d70c6cf9b.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA841/015331b776ca61ff005850fa1d0bb5afb1596b77.png)