unsigned long long
by pzc2004 @ 2019-11-16 13:52:27
[格雷码 - OI Wiki](https://oi-wiki.org/misc/gray-code/#_4)
`n ^ (n >> 1)`
by Wh_Xcjm @ 2019-11-16 13:52:30
@[神犇梦的蒟蒻](/user/59841) 开ull呢,建议手写快速幂(没啥卵用)
by daqirui @ 2019-11-16 13:52:58
码风劝退
by REFLAME_ASH @ 2019-11-16 13:53:33
@[daqirui](/user/113852) ~~位运算不好吗~~
by pzc2004 @ 2019-11-16 13:53:44
@[WEMS_pzc](/user/60075) 用了的话能过2的64次方吗
by 神犇梦的蒟蒻 @ 2019-11-16 13:55:14
递归分类写不好吗?
by resftlmuttmotw @ 2019-11-16 13:55:24
@[神犇梦的蒟蒻](/user/59841) ~~大样例过了的我不虚~~
by pzc2004 @ 2019-11-16 13:56:00
while那是NN>k
by 神犇梦的蒟蒻 @ 2019-11-16 13:57:27
就是不会才问的啊
by 神犇梦的蒟蒻 @ 2019-11-16 13:57:54