UVA393 The Doors

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=5&page=show_problem&problem=329 [PDF](https://uva.onlinejudge.org/external/3/p393.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA393/38851bd71835031afeccca9711330d20ccbf6933.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA393/655c4e6a267cdbd612aff12d8367fd69f1356870.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA393/0aa5942edece3fe36e6b43169fa33361fa1f2b46.png)