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这个怎么证明

Posted by newton88518 at 2006-01-19 13:47:20 on Problem 1063 
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
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