UVA13223 Graph Colorings

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=878&page=show_problem&problem=5146 [PDF](https://uva.onlinejudge.org/external/132/p13223.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13223/e4e5da4df0e0479091907985520d443d9b48cdd8.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13223/a44ad4a2dd3143e75922090e0ad1c497081f7daf.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13223/f761cf2b2026e6207abd2a8e8c6c834d360288b2.png)