@[Steve_bm](/space/show?uid=96570)
# $1<=N<=2^{40}$
by UKE自动稽 @ 2018-04-23 10:51:31
@[_UKE自动机_](/space/show?uid=71371) 明白了，谢谢
by RiverFun @ 2018-04-23 11:13:12
> 数学题！
@[Steve_braveman](/space/show?uid=96570)
by lion0514 @ 2018-08-19 15:25:38