UVA11719 Gridland Airports

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=117&page=show_problem&problem=2766 [PDF](https://uva.onlinejudge.org/external/117/p11719.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11719/b2ef46a6837e9a94054c51d33225cfbaa90e87e7.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11719/39ea098b57ac2e27d21f9d8fe86aea14654e8321.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11719/1dc8a123d98d9d8eab4ac1ec07abfd23e9bb8c81.png)