UVA11814 Stack Machine

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=2914 [PDF](https://uva.onlinejudge.org/external/118/p11814.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11814/b6d1492d6e6da48196ca406cf86334cbc6afa7ab.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11814/28bcbde74ef5d1e7215718a7b32b4820a14743ea.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11814/2a8501f773a699d7ea89e2785ef8e1b4588644e2.png)