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表示100组数据里面这组比较有用

Posted by resetinput at 2014-04-15 14:34:24 on Problem 1848
In Reply To:测试数据 Posted by:liumeng at 2013-02-25 17:48:08 
20
13 7
2 8
3 1
10 1
15 12
5 3
1 7
11 15
9 8
9 6
5 17
1 2
5 18
16 4
2 12
14 18
14 4
19 13
13 20

ans:
5

可以手图的。
【其实就是注意自己连自己的一个链（点数大于等于3）】
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