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补充In Reply To:解题思路，及公式的推导，供大家参考 Posted by:xiao1590 at 2007-02-20 12:58:16 (n/2)*(n-1)/2应为(n/2)*((n-1)/2)，对于偶数的情况下应先将(n-1)/2算出，去尾数后再与n/2相乘才正确 Followed by:
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