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北京大学暑期课《ACM/ICPC竞赛训练》面向全球招生!

测试数据

Posted by 14110581002 at 2015-08-21 08:12:04 on Problem 1129
10
A:BCDEFG
B:ACGH
C:ABDH
D:ACEHJ
E:ADFIJ
F:AEGI
G:ABFHI
H:BCDGIJ
I:EFGHJ       
J:DEHI

4 channels needed.

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