codeforces round 252 (div.2 ) D
2014-07-13 15:30
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置换群的基本问题,一个轮换内交换成正常顺序需要k-1次,k为轮换内元素个数
两个轮换之间交换元素,可以把两个轮换合并成1个,总交换次数+1
一个轮换内部交换,可以把一个轮换拆分成两个,总交换次数-1
两个轮换之间交换元素,可以把两个轮换合并成1个,总交换次数+1
一个轮换内部交换,可以把一个轮换拆分成两个,总交换次数-1
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