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长度为奇数的环可以跟自己合并;长度为偶数的环,可以跟长度一样的环合并In Reply To:大家这题怎么做的啊? 意思是不是用一个变换,变两次? 问是否存在这种变换? 我先找环,合并同个数的两个环,看是否能合并完.这样对不对? Posted by:h2x at 2006-12-02 14:20:19 Followed by:
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