啊这么神奇么（）同求还能怎么卡（）（）（）
by Fractured_Angel @ 2024-03-30 11:14:33
@[the_long_way_to_dp](/user/837888) @[MessageBoxA](/user/77584)
见： <https://www.cnblogs.com/Hs-black/p/12219270.html>
by QWQ_123 @ 2024-03-30 11:16:17
[https://codeforces.com/blog/entry/60442](https://codeforces.com/blog/entry/60442)
by happybob @ 2024-03-30 15:08:47