@[wenhao801](/user/31488) 话说你谷怎么天天有人问换根 dp 题啊
Crash 的文明世界
by Karry5307 @ 2019-11-15 12:42:33
~~[【AFOI-19】面基](https://www.luogu.org/problem/P5628)~~
by saxiy @ 2019-11-15 12:53:21