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Re:这题有公式么，谁能给点提示么。 好像和置换群有关In Reply To:这题有公式么，谁能给点提示么。 好像和置换群有关 Posted by:lemongxr at 2004-01-19 19:50:37 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:
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