[AtCoder] Takahashi has an ability to generate a tree using a permutation (p_1,p_2,...,p_n) of (1,2,...,n), in the following process: - 题解

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题目信息
题号 P20447
标题 [AtCoder] Takahashi has an ability to generate a tree using a permutation (p_1,p_2,...,p_n) of (1,2,...,n), in the following process:
难度 提高+
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