UVA221 城市正视图 Urban Elevations

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=4&page=show_problem&problem=157 [PDF](https://uva.onlinejudge.org/external/2/p221.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA221/a317959f50a745431cb907c8be6ac4763f7a1c08.png)

Input Format

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Output Format

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