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第一步和最后一步必须是1,中间的每一步只能:比上一步大1,相等,或者小1In Reply To:Re: by one smaller than the length of the previous step Posted by:tcxgsy at 2005-08-17 21:55:41 > 最后一步不是必须是一吗 Followed by: Post your reply here: |
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