ToDoList
https://projecteuler.net/problem=654
https://blog.trisolaris.top/cf1153f/
https://www.cnblogs.com/ywwyww/p/9279403.html
https://blog.csdn.net/xyz32768/article/details/86305240
http://210.33.19.103/contest/1147 T2
https://blog.csdn.net/corsica6/article/details/86560413
http://hzoi2017-csm.blog.uoj.ac/blog/5000
Time
2019.5.2
Codeforces Round #556 (Div. 1)
Solved A B C
Learned D E
2019.5.3
2016-2017 7th BSUIR Open Programming Contest. Semifinal
Solved B C D E G H
2019.5.4
Forethought Future Cup - Elimination Round
Solved A B C D
Idea E
2019.5.5
Codeforces Round #557 (Div. 1) [based on Forethought Future Cup - Final Round]
Solved A B C D
Mathforces: Tech Scouts Online Test 2018 (just fun and practice, unofficial, unrated)
Solved A B C D E J K N
2019.5.6
Codeforces Round #320 (Div. 1) Bayan Thanks-Round
Solved A B C D
2019.5.7
Codeforces Round #530 (Div. 1)
Solved A
2019.5.13
Codeforces Round #559 (Div. 1)
Solved A B C
2019.5.15
Codeforces Round #512 (Div. 1, based on Technocup 2019 Elimination Round 1)
Solved A B C D
2019.5.20
Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 1)
Solved A B D
Learn
线性代数
线性代数在OI中的应用与题目讲解 李超
https://wenku.baidu.com/view/3a9d780feff9aef8941e06b6.html
第01讲 行列式的定义及性质
https://wenku.baidu.com/view/3332fbfbcc22bcd127ff0c49
第02讲 行列式的计算
https://wenku.baidu.com/view/03a99036336c1eb91b375d4b
第03讲 Cramer法则
https://wenku.baidu.com/view/3f974c4b5727a5e9846a614a
第04讲 矩阵的加法数乘和乘法
https://wenku.baidu.com/view/3fe7e5b64028915f814dc257
有标号的DAG计数I~IV
https://www.cnblogs.com/zhoushuyu/p/10077241.html
多项式
https://www.cnblogs.com/ywwyww/p/8511505.html
Solutions to TopCoder Open 2013's Hard Problems
http://picks.logdown.com/posts/208980-solutions-to-topcoder-open-2013s-hard-problems
最小圆覆盖
https://wenku.baidu.com/view/162699d63186bceb19e8bbe6.html
https://en.wikipedia.org/wiki/Smallest-circle_problem
拉格朗日反演
http://zjt-blog.cc/articles/63
https://blog.csdn.net/hjuy134/article/details/45052149
扩展拉格朗日反演
http://zjt-blog.cc/articles/151?jump_page=2
佩尔方程
https://baike.baidu.com/item/佩尔方程
Problem
CodeChef TREEWALK
https://www.codechef.com/problems/TREEWALK
BM算法，CH算法