https://www.luogu.com.cn/blog/command-block/wei-yun-suan-juan-ji-yu-ji-kuo-zhan
为啥 c(i,j)=c(i0,j0)c(i1,j1)...c(i,j)=c(i_0,j_0)c(i_1,j_1)...c(i,j)=c(i0,j0)c(i1,j1)... ？
