dfs1里siz[u] += siz[v] 写成 siz[u] += v 竟然有五十分...此贴终结已AC by danefishhh @ 2019-10-23 16:28:10
ORZ,感谢老哥， 我和你犯了同样的错误，为啥能a50分啊！！！ by Retired @ 2021-09-23 21:28:53