UVA12129 Flight Safety

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=243&page=show_problem&problem=3281 [PDF](https://uva.onlinejudge.org/external/121/p12129.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12129/99cf25a1601af481ac84975d49cd848167e1f7ec.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12129/08dcb3d4c4dcfdebee3ab8363e8485ada014c24e.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12129/0f4e24f47216cff50f56b826b9efa36ff7504d6a.png)