UVA11770 Lighting Away

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2870 [PDF](https://uva.onlinejudge.org/external/117/p11770.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11770/0c1aaef5f5cba264b99879d87876a2e7aeee4540.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11770/786a7d1735664a279db0dc4d34bd397fc18b7a7d.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11770/090217039774000e93229a2837cf19ff8474e35d.png)