@[_Alexande_](/user/363006)
1.线段树开 $1e3$ 您是个勇者
2.无向边,边数 $\times2$
by ningago @ 2022-05-25 14:52:50
@[ningago](/user/371968) ~~我写得是分块。~~
by wangyibo201026 @ 2022-05-25 15:11:35
@[_Alexande_](/user/363006)
~~我是瞎子,这玩意有人写分块我开了眼~~
by ningago @ 2022-05-25 15:21:54