n<=20这个范围是认真的吗?

P1595 信封问题

@[chen_zhe](/space/show?uid=8457) @[yjjr](/space/show?uid=5088)
by Drinkkk @ 2018-02-20 16:32:03


已加入todolist
by chen_zhe @ 2018-02-20 16:54:10


@[VioletEvergarden](/space/show?uid=78139) 用longlong就OK了
by Billy●Herrington @ 2018-08-16 11:30:03


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