UVA193 Graph Coloring

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=129 [PDF](https://uva.onlinejudge.org/external/1/p193.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA193/550b3f8acbbc4c45392549d84ebc7e29e59b9428.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA193/e3f776deecdfe7122d51b6ad56a5a707e3aeea62.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA193/d2a5c463a32441e09bfb1f61731564a0170b199b.png)