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219MS 感动的要死。。。贡献一组数据

Posted by lmysoar at 2013-11-30 22:52:30 on Problem 1741
In Reply To:看到297MS AC时感动得热内盈眶了... Posted by:intheway at 2010-07-23 22:19:59 
一直在T，最后不信邪自己出了一组数据，发现树的重心写傻了。。。
贡献一组数据
Input:
10000 10000000
1 2 100
2 3 100
3 4 100
......
9999 10000 100
Output:
49995000
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