https://www.luogu.org/problem/show?pid=3383
https://www.luogu.org/problem/show?pid=3390
//矩阵乘法 http://www.ruanyifeng.com/blog/2015/09/matrix-multiplication.html
模板题
原文：http://www.cnblogs.com/gc812/p/6066111.html
