2019-C04

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原文章内容如下：

= Platform =
[http://sua2019.contest.codeforces.com/group/H7nsMkHC7I/contest/248524 CF Group]

= Ranklist =
[[Image(rc4.png)]]

= Upsolving =

[http://codeforces.com/gym/100886 CF Gym]

= Solution =
[https://icpc.camp/three-investigators/2015-2016%20Petrozavodsk%20Winter%20Training%20Camp,%20Saratov%20SU%20Contest three-investigators] [[br]]
[https://acm.ecnu.edu.cn/wiki/index.php?title=2015-2016_Petrozavodsk_Winter_Training_Camp,_Saratov_SU_Contest ECNU Foreigners]

Platform

CF Group

Ranklist

Upsolving

CF Gym

Solution

three-investigators [[br]]

ECNU Foreigners

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