UVA11779 Lost File

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2879 [PDF](https://uva.onlinejudge.org/external/117/p11779.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11779/2d7da281aaa08566afac85935f2424b0a21c4046.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11779/78727ddfcf3538f1bc07541d10273a4dd6381c5f.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11779/772177c70d0670afffc21b4a247fa32bcb983ea0.png)