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这题是有很专业的数学知识的,先是看了IOI2002对这题的解题报告,但是发现算法描述得很含糊,然后看了解题报告中的参考文献“[1] J.-M. Ho, D. T. Lee, C.-H. Chang, C. K Wong, Minimum diameter spanning trees anFollowed by:
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