UVA10606 Opening Doors

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=18&page=show_problem&problem=1547 [PDF](https://uva.onlinejudge.org/external/106/p10606.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10606/ae31afc15ed069930c58eb12b3042f5870e1f0cd.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10606/5186ce25d5278f035e144dfe9a5106dfc5515eee.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10606/3073ef5a742612768dc1ebd534dc858a769171f1.png)