……发现 $b$ 更长
$len=17707$
by gorokokoro @ 2018-05-08 13:32:34
……顶楼打错了
应该是 $len\leq 10000$，$len =10123$
by gorokokoro @ 2018-05-08 13:33:53
%%%
by Smoggy @ 2018-05-08 13:39:58
@[Ghastlcon](/space/show?uid=34354) fixed
by chen_zhe @ 2018-05-08 18:57:44