UVA12567 《第七页》、《时空轮回》与水的故事 Never7, Ever17 and Water

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[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=441&page=show_problem&problem=4012 [PDF](https://uva.onlinejudge.org/external/125/p12567.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12567/cf25daadb2fb70b0e8c86fe9a314fbf83fd39f23.png)

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