dp练习

https://www.luogu.org/problem/show?pid=2347      求方案种类的 

https://www.vijos.org/p/1334    二维费用背包    

https://www.luogu.org/problemnew/show/1833  两个背包

https://www.luogu.org/problem/show?pid=1137#sub

https://www.luogu.org/problemnew/show/1734  需要转化的dp

https://www.luogu.org/problemnew/show/2733

https://www.luogu.org/problemnew/show/1282一道较难的dp

未过：

　　三维https://www.vijos.org/p/1154