UVA12454 Plan B for next SWERC

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=279&page=show_problem&problem=3885 [PDF](https://uva.onlinejudge.org/external/124/p12454.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12454/5e584a67e390150b83a81c0231e1f218b0732c12.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12454/c2aea0baae24f634134dd728eda9d23286ffdd29.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12454/bf9f96b12b03795cb03f33319736a71b3a2e0f6c.png)