[AtCoder] For an integer N, we will choose a permutation \{P_1, P_2, ..., P_N\} of \{1, 2, ..., N\}. - 题解

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题目信息
题号 P20423
标题 [AtCoder] For an integer N, we will choose a permutation \{P_1, P_2, ..., P_N\} of \{1, 2, ..., N\}.
难度 提高-
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