注意题中说的是**无向图**，所以要双向建边
by Brilliant11001 @ 2023-12-31 13:30:37
@[Brilliant11001](/user/602372) AC 了，膜拜大佬
by heyx0201 @ 2024-01-01 21:59:03
V->U W
by _ikun_newperson @ 2024-01-22 10:36:11