UVA12872 Hidden Plus Signs

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=861&page=show_problem&problem=4737 [PDF](https://uva.onlinejudge.org/external/128/p12872.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12872/bd6bc34f22ea8da1b50324dde0ea3c09efb65b62.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12872/ce11833a775e69f48fe488e268e7fa29e780f102.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12872/ee402a4f695c61fb2f52990a04409399e0e40f80.png)