UVA400 Unix Is命令 Unix ls

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=341 [PDF](https://uva.onlinejudge.org/external/4/p400.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA400/680cbafc296b2548dafcf7654cd4f9b2a8b61149.png)

Input Format

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Output Format

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