Help is needed for Dexter

题目描述

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=25&page=show_problem&problem=2379 [PDF](https://uva.onlinejudge.org/external/113/p11384.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11384/7bca5c9a6662aff354fcfae99e0bb5ad93466086.png)

输入输出格式

输入格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11384/0e73cf3d2e541f65e5d04930fb5592d430918f1f.png)

输出格式

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11384/230d9084d0974efab26660703e0e373f1a4cfd57.png)

输入输出样例

输入样例 #1

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输出样例 #1

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