https://www.luogu.com/article/2vqkpdn0 这不得来爽一下。
by xlpg0713 @ 2024-03-20 10:08:03
@[Warp](/user/305891) 给定字符串s，要求重新安排s中字符的顺序使得任意相邻两个字符都不同，求合法方案数mod 1e9+7
其中n是5000
by 寒烟冷浅暮殇 @ 2024-03-20 10:38:37
@[寒烟冷浅暮殇](/user/28397) 似乎用到 P8594 的 trick 可以 $\Theta(n^2)$ 做？
by 夜明 @ 2024-03-20 11:03:58
@[xlpg0713](/user/680400) 谢谢
by 夜明 @ 2024-03-20 11:04:18
https://www.luogu.com/article/xon17oly
by eastcloud @ 2024-03-20 12:57:13
AGC019F
by STUDENT0 @ 2024-03-20 17:21:52
@[Warp](/user/305891) AGC015E
by Register_int @ 2024-03-20 17:27:11
P10254
by wukaichen888 @ 2024-03-23 13:45:33