手写吧（逃
by p_b_p_b @ 2018-12-12 15:31:52
手写吧（逃
by GTBA @ 2018-12-12 15:35:10
直接log2(len)不就好了=。=
by 赫鲁老七 @ 2018-12-12 15:35:12
@[NewweN](/space/show?uid=158175) 有理=。=
by ydnhaha @ 2018-12-12 15:41:24
fft为啥需要log2啊……
迷的一匹
by shadowice1984 @ 2018-12-12 16:02:41
可以直接 `lg[i]=lg[i>>1]+1` 递推啊
by Owen_codeisking @ 2018-12-12 16:33:24
Orz楼上两位大佬
by 南城忆潇湘 @ 2019-01-30 17:34:57
~~应该是6位~~
by 南城忆潇湘 @ 2019-01-30 17:35:32