UVA11671 矩阵中的符号 Sign of Matrix

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=78&page=show_problem&problem=2718 [PDF](https://uva.onlinejudge.org/external/116/p11671.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11671/47faa53bfe1eb7a84124ad21450a03ea16c25b01.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11671/8532021e0ed0f75534453a7e8e65620e59e50471.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11671/61833106e8031a9756a111bca39747585d0abfbc.png)