UVA971 Towers

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=912 [PDF](https://uva.onlinejudge.org/external/9/p971.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA971/f2fe36ce80b09f53947bf9f5855a16b4ba455631.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA971/8090b85b1cf299b9ba05d87df9a0f57f411e11e5.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA971/2cf40f56af5ab27dc4e953aecfefb372ad9ccc7d.png)