开两倍大
by qwqKanade @ 2017-09-07 17:42:52
四倍大最保险
by zhengrunzhe @ 2017-09-07 17:54:17
哇 谢谢你们 突然想起f开小了
by Capella @ 2017-09-07 17:59:16
@[zhengrunzhe](/space/show?uid=14374) 大概是2^p>n(p正整数)时就足够了
by doby @ 2017-09-07 18:00:25