UVA11797 Drutojan Express

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2897 [PDF](https://uva.onlinejudge.org/external/117/p11797.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11797/5e2a82bbd4f1d53121731403223f9e6f7382846b.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11797/893614fe207efe25e03f4374e38ab33a69f5d0ad.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11797/fb1051de95ef79fa7d8b32b586989b0c64c14ea9.png)