[AtCoder] We have a permutation p = {p_1,\ p_2,\ ...,\ p_n} of {1,\ 2,\ ...,\ n}. - 题解

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题目信息
题号 P15846
标题 [AtCoder] We have a permutation p = {p_1,\ p_2,\ ...,\ p_n} of {1,\ 2,\ ...,\ n}.
难度 普及-
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