UVA11861 Explosion

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2961 [PDF](https://uva.onlinejudge.org/external/118/p11861.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11861/4d72633877ac6c04ba3e4d24e9374579a5c558c8.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11861/35f2ae63834214f0187407d24e609afff4000234.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11861/44a84787fcd95320ec2af2e07ad3be2a08b46cb7.png)