UVA456 Robotic Stacker

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=6&page=show_problem&problem=397 [PDF](https://uva.onlinejudge.org/external/4/p456.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA456/e10a4807528ebdbe0504b02121bfce1614d4d9d2.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA456/162b2ce8512b493f5ca0e1ec9ceff770cc0a8d95.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA456/8ead7a945f4e15f618d4acf82f86fd9961ef832f.png)