UVA823 Stopper Stumper

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=764 [PDF](https://uva.onlinejudge.org/external/8/p823.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA823/a13ea02c951f196f37c10a5d75ec81353ec63866.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA823/2bb89c266d740bbb84f9c560a7af360eefe721e1.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA823/7644ca58d5d5eec31807d6bea7e41644c2ae8e15.png)