问题如下：
[第一个问题](https://www.luogu.org/discuss/show/85711)
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[第二个问题](https://www.luogu.org/discuss/show/65156)
by SSHhh @ 2019-02-07 16:57:17
输入格式那儿还少了一个m
by 乙津梦 @ 2019-03-29 08:47:10