uid=478905 他的大部分题解都来自站外，百度都能搜到，建议全部爆破

https://www.luogu.com.cn/blog/EthanCai/solution-p7527 -> https://blog.csdn.net/Brian_Pan_/article/details/115466751

https://www.luogu.com.cn/blog/EthanCai/solution-p7538 -> https://blog.csdn.net/qq_37656398/article/details/94740509

https://www.luogu.com.cn/blog/EthanCai/solution-p3494 -> https://blog.csdn.net/popoqqq/article/month/2015/05