UVA11548 Blackboard Bonanza

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=27&page=show_problem&problem=2543 [PDF](https://uva.onlinejudge.org/external/115/p11548.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11548/408ead3eb465ef5a4165364cea9a6ff7877d5870.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11548/85585a6a0fe20f9932c80cda6453cf0d17016642.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11548/b364a62761a5d985c6d95ff87d4ad1c675c5bc01.png)