https://www.luogu.com.cn/problem/P1057
by Yukinoshita_Yukino @ 2021-02-24 16:02:53
看题解吧
by Yukinoshita_Yukino @ 2021-02-24 16:03:14
@[Crazy_Bucket](/user/173323) 好的谢谢
by 屑稻香 @ 2021-02-24 16:04:10
@[风散稻香](/user/320656) 我忘了有向图的是不是这道了/yun
我只记得一个无向图的https://www.luogu.com.cn/blog/173323/solution-p6175#
by Yukinoshita_Yukino @ 2021-02-24 16:06:13