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谢谢了In Reply To:Re:这题有公式么，谁能给点提示么。 好像和置换群有关 Posted by:pladene at 2004-02-03 09:17:07 > 考虑每flip一次，盘子位置的变化。 > 给盘子所在位置按1,2,3，……编号，如果总数是奇数，则通过flip，盘子可以到任何位置；否则，flip不能改变其所在位置的奇偶性 Followed by: Post your reply here: |
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