UVA10214 树林里的树 Trees in a Wood.

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=14&page=show_problem&problem=1155 [PDF](https://uva.onlinejudge.org/external/102/p10214.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10214/50c1f69fedc915b5433ce438aa7604af34fd8f42.png)

Input Format

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Output Format

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