第一种是用深搜加记忆化。
第二种是动态转移方程
by Harry_Chen @ 2017-10-25 22:47:33
@(漫·默温无人)[https://www.luogu.org/space/show?uid=49774]
by Harry_Chen @ 2017-10-25 22:49:55
@(漫·默温无人)[https://www.luogu.org/space/show?uid=49774]
by Harry_Chen @ 2017-10-25 22:50:40