UVA12361 File Retrieval

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=278&page=show_problem&problem=3783 [PDF](https://uva.onlinejudge.org/external/123/p12361.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12361/b51cac8ba1d01b0097a6472d7d5916afd4bea80c.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12361/63c8082db0c4fc70b66d73fb07dbbc34bdeab3f1.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12361/2908e9aaafab4d435efa98aaa8502004896837a1.png)