~~(from, to) 的 from 和 to 是变量名称，和边的方向无关~~
by SSerxhs @ 2021-03-04 13:49:18
~~加边，加边，并查集查询！~~
by Masna_Kimoyo @ 2021-03-04 14:31:04
@[纳吉的宝洞](/user/147401) (from,to)是没有方向的啊，只是代表$from,to$之间有一条边$(1,2)$和$(2,1)$是一个东西
by oisdoaiu @ 2021-03-04 14:50:17
~~见加边进贴~~
by quest_2 @ 2021-03-04 15:40:05
@[oisdoaiu](/user/56825) 我 明（shi）白（s）力（b）
by koishi_offical @ 2021-03-04 18:31:27
~~见加边进帖~~
by XLao @ 2021-05-16 18:16:53