UVA12954 Spiral

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=862&page=show_problem&problem=4833 [PDF](https://uva.onlinejudge.org/external/129/p12954.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12954/ad711132d96b88223302a59b94691d9e36d7046a.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12954/09fd97f1eafcb54fb5dc98865726df11f2c41e4b.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12954/670d2044d093c136f3b7c9f75dab22637f297f72.png)