UVA12016 Herbicide

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=242&page=show_problem&problem=3167 [PDF](https://uva.onlinejudge.org/external/120/p12016.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12016/2856eb07bc7f7887928fcd665b7a71681e19ecd5.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12016/eabce8ecc64dfcecf145099af3f6845b8583442e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12016/9078a875a862fc2aeaff1921c58bec8f37271191.png)