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水题...其实这道题的数据是弱了 因为直接模拟的话时间复杂度会很不确定.. 有一个更加先进的方法可以把这个问题做到log(n)，详细请看 "置换群快速幂运算"(话说我也不知道是什么东西..路漫漫其修远兮,吾将上下而求索..研究研究.) Followed by:
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