树状数组
https://blog.csdn.net/flushhip/article/details/79165701
FFT
https://blog.csdn.net/ggn_2015/article/details/68922404
良心的可持久化线段树教程：http://www.cnblogs.com/RabbitHu/p/segtree.html
【填坑】可持久化线段树解决无修改的区间k大问题http://blog.csdn.net/farestorm/article/details/50337527
主席树：http://www.cnblogs.com/zinthos/p/3899565.html
luogu 模板？ http://www.neptuuz.com/wordpress/?p=234
带修改区间第k大的几种解法：http://blog.csdn.net/htt_h/article/details/
LCT
http://www.cnblogs.com/zwfymqz/p/8972914.html#_label5
http://www.cnblogs.com/flashhu/p/8324551.html
欧拉定理扩展
https://www.cnblogs.com/ywwyww/p/8510981.html
后缀数组
https://www.cnblogs.com/victorique/p/8480093.html
LCA & RMQ
https://blog.csdn.net/niuox/article/details/7978735
乘法逆元
https://blog.csdn.net/guhaiteng/article/details/52123385
关于欧拉筛求phi的讨论
https://blog.csdn.net/Clove_unique/article/details/50805803
莫比乌斯函数的应用
https://www.cnblogs.com/Milkor/p/4474835.html