UVA12191 File Recover

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3343 [PDF](https://uva.onlinejudge.org/external/121/p12191.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12191/9387e79b9a65c54de6dec87cbae2d24ba30e4e97.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12191/789124fd20f6927e6a2c4a32c5e7cfc4ed1df80f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12191/235aa5c35b090e930a9381db5b7c1a2bef450e7e.png)