UVA12687 Cleaning the Hallway

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=602&page=show_problem&problem=4425 [PDF](https://uva.onlinejudge.org/external/126/p12687.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12687/4100e3772db17dd29c1928e126e6fac483480f70.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12687/796261c02ff0a7f9b2f438f960708c88a6963bf4.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12687/f8dcb1d021be38cf33cff9ba2a87e30d01560416.png)