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过的试试这组数据

Posted by zyue1105 at 2009-10-03 20:34:09 on Problem 1639 
13
Park 1 9
Park 2 10
Park 3 10
Park 4 10
Park 5 10
Park 6 10
Park 7 10
1 2 11
1 4 13
2 3 12
4 5 14
5 6 14
6 7 13
6
answer:70
PKU的数据删边后不维护也能过
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