一、基础知识
(1)矩阵乘法
http://poj.org/problem?id=3070
http://poj.org/problem?id=3233
http://acm.hdu.edu.cn/showproblem.php?pid=2276
http://acm.hdu.edu.cn/showproblem.php?pid=5015
https://ac.nowcoder.com/acm/contest/338/L
(题解:https://paste.ubuntu.com/p/8pMmJc6SDn/)