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这题貌似数据弱了。看下面这个数据

Posted by Mcfaddan_b at 2009-05-18 18:41:11 on Problem 3398
最小支配集算法结果是2
但结果明显是3

9
1 4
2 4
3 4
4 5
5 6
6 7
6 8
6 9
0

1       7
 \     /
2-4-5-6-8
 /     \
3       9

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