欧拉图
题单介绍
一些有关欧拉图的题目
[P1341 无序字母对](https://www.luogu.com.cn/problem/P1341)
[P2731 [USACO3.3]骑马修栅栏 Riding the Fences](https://www.luogu.com.cn/problem/P2731)
[P3443 [POI2006]LIS-The Postman](https://www.luogu.com.cn/problem/P3443)
[P3511 [POI2010]MOS-Bridges](https://www.luogu.com.cn/problem/P3511)
[P3520 [POI2011] SMI-Garbage](https://www.luogu.com.cn/problem/P3520)
[P4221 [WC2018]州区划分](https://www.luogu.com.cn/problem/P4221)
[P7684 [CEOI2005] Depot Rearrangement](https://www.luogu.com.cn/problem/P7684)
[P7771 【模板】欧拉路径](https://www.luogu.com.cn/problem/P7771)