赤
wqs二分
https://www.cnblogs.com/Juve/p/11479423.html
https://www.cnblogs.com/Rorschach-XR/p/11479602.html
反悔贪心
https://www.cnblogs.com/cjyyb/p/9367948.html
https://www.cnblogs.com/Miracevin/p/9795871.html
https://blog.csdn.net/weixin_34344677/article/details/94456977
影魔
https://www.cnblogs.com/Gkeng/p/11509140.html
树上问题
https://www.cnblogs.com/Slrslr/p/9398205.html
欧拉回路好题
https://blog.csdn.net/A1847225889/article/details/84624877