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就是一个排列组合的问题！最后推出的公式的形式是很简单的。In Reply To:谁说说这题怎么推啊？想了很久没想出来。 Posted by:Wendell at 2004-03-22 13:26:01 就是一个排列组合的问题！最后推出的公式的形式是很简单的。 Followed by:
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