https://github.com/learn22coding/algorithms
https://github.com/learn22coding/aoapc-bac2nd
https://github.com/learn22coding/noip_oi
https://github.com/learn22coding/algorithm_contest_tedukuri
https://github.com/learn22coding/NOIP
https://github.com/learn22coding/awesome-competitive-programming
https://github.com/learn22coding/OI-wiki
👉https://github.com/learn22coding/shareOI
https://github.com/learn22coding/OI-Public-Library
https://algorithms.tutorialhorizon.com/
https://web.ntnu.edu.tw/~algo/
https://codeforces.com/problemset/page/1?tags=constructive+algorithms
http://courses.csail.mit.edu/6.851/
http://courses.csail.mit.edu/6.851/spring12/lectures/
MIT Introduction to Algorithms https://www.youtube.com/watch?v=ZA-tUyM_y7s&list=PLUl4u3cNGP63EdVPNLG3ToM6LaEUuStEY
https://en.wikipedia.org/wiki/List_of_terms_relating_to_algorithms_and_data_structures
应对unordered_map被卡的方法 https://codeforces.com/blog/entry/62393
Barrett Reduction 乘法取模加速 https://www.luogu.com.cn/blog/Sweetlemon/barrett-reduction
压位 trie https://www.luogu.com.cn/blog/forever-captain/w-trie
（基于 DIF-DIT 重构于 NOI 2022 后的）多项式基础全家桶 https://www.luogu.com.cn/paste/gye7bk2d
a list of almost all useful blogs ever published on Codeforces https://codeforces.com/blog/entry/91363
Collection of little techniques https://codeforces.com/blog/entry/100910