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

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Output Format

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