UVA814 邮件传输代理的交互 The Letter Carrier's Rounds

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=755 [PDF](https://uva.onlinejudge.org/external/8/p814.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA814/ce9250ad50e7737c43213a539668fb6c23f3d0ea.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA814/f5728826144f1356571357078ceb40d6d77cbd02.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA814/ccad3c3a3b664c8a1cb83b9a2ac50915f4da21fa.png)