@[hegm](/user/331947) 您来帮忙
by yizhiming @ 2022-11-03 16:57:27
@[randnameaaa](/user/374893) 边开小了，应该是 $ 4\times n$
by hegm @ 2022-11-03 17:09:51
@[hegm](/user/331947) 感谢巨佬，已解决
by randnameaaa @ 2022-11-03 17:29:10
树剖几个数组应该开 `N<<1` 的，眼睛可以捐了qwq
by randnameaaa @ 2022-11-03 17:36:03