UVA11382 Fear of The Dark

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=25&page=show_problem&problem=2377 [PDF](https://uva.onlinejudge.org/external/113/p11382.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11382/379a9e0513240479d793bb1838b57e7ebc05f06a.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11382/5ae99c5e995d6acda1cd0eb20c3d51cddc12ebb1.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11382/2ce5da4ed4acaf5afe572e8eddf02f189a49f92a.png)