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对一组数据有点不明白了？

Posted by hhgff at 2010-01-13 18:46:15 on Problem 3352 
7 6
1 2
1 3
2 4 
2 5
3 6
3 7

为什么被人AC的代码是2，但是本人认为至少要3才够！！
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