UVA12227 虫洞 Wormholes

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=244&page=show_problem&problem=3379 [PDF](https://uva.onlinejudge.org/external/122/p12227.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12227/f4b64b4a250b0c8d12df93c369db55f87ac8bc8d.png)

Input Format

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Output Format

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