@[多弗桃](/space/show?uid=63661) 好吧,我错了…… [asdfghjkl123] 被 [读题] 击杀了 by asdfghjkl123 @ 2018-07-18 15:00:22
一个图|v|,v-1条边,连通就是树 by RainFestival @ 2019-03-20 20:37:47