蒟蒻初学BFS，麻烦dalao们帮助。
by 2huk @ 2023-01-25 16:13:40
据我所知，本题需要记忆化。
by a2lyaXNhbWUgbWFyaXNh @ 2023-01-25 16:33:35
@[2huk](https://www.luogu.com.cn/user/748509)
~~正解应该是记忆化搜索吧？~~
by sijiajun @ 2023-02-20 21:40:56