2019-C21

从 Trac 迁移的文章

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原文章内容如下：

= Platform =
[http://sua2019.contest.codeforces.com/group/H7nsMkHC7I/contest/255180 CF Group]

= Ranklist =
[[Image(rc21.png)]]

= Upsolving =

[https://codeforces.com/contest/1089 Codeforces]

= Solution =
See attachment for the official solution.

Platform

CF Group

Ranklist

Upsolving

Codeforces

Solution

See attachment for the official solution.

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