UVA10763 交换学生 Foreign Exchange

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=19&page=show_problem&problem=1704 [PDF](https://uva.onlinejudge.org/external/107/p10763.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10763/8a10bf41b75e6c0d89a5ec2ae49ccdae5c04458b.png)

Input Format

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Output Format

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