dongjiajiedc @ 2018-03-10 17:41:54
非正规：a both another first second third
another是几啊
by wisdom_grass @ 2018-03-10 17:53:32
（以前我也被坑过
by a13518354766 @ 2018-03-10 18:31:55
https://www.luogu.org/discuss/show?postid=18634 这位大佬已经解释地很详细了 = =
by dongjiajiedc @ 2018-03-11 18:33:21
谢谢