你这是$O(n^2)$的肯定T飞了啊
by Disjoint_cat @ 2022-08-10 10:27:32
@[zhangze20110317](/user/685158)
by Disjoint_cat @ 2022-08-10 10:30:17
used数组用树状数组维护
by VictorChen @ 2022-08-23 08:23:36
你全都没模呀
by csd2011 @ 2022-08-28 13:40:41
x += tmp * f[n-i]%998244353;
by csd2011 @ 2022-08-28 13:41:42
@[zhangze20110317](/user/685158)
- 开 $long \ long$。
- 答案对 $998244353$ 取模
by 晨曦墨凝 @ 2022-09-27 19:49:15
上述操作能让你拿 $50 \ pts$，剩下 $50 \ pts$ 得用线段数组维护
by 晨曦墨凝 @ 2022-09-27 19:50:51
@[晨曦墨凝](/user/556826) orz我学不会怎么办啊
by smy2006 @ 2022-10-09 19:46:43
@[smy2006](/user/218752)
$\color{white}666$
by 晨曦墨凝 @ 2022-10-10 15:48:45