UVA497 Strategic Defense Initiative

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=438 [PDF](https://uva.onlinejudge.org/external/4/p497.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA497/0e7f0e80da5f9ba898c9f2434c9343c3624e37c0.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA497/0cd7a41a5b041de089b96606ea00731687f9beea.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA497/7a70d8d15ed0718bea6c9f5c0a529607c3b54c46.png)