忽然发觉自己代码可读性很差（？
by Velix @ 2020-08-19 08:49:54
果然我是屑，根本没有人理我/kk
by Velix @ 2020-08-19 09:15:06
已AC，我是SB未开long long……
by Velix @ 2020-08-19 10:19:39