[AtCoder] There are N children standing in a line from left to right. The activeness of the i-th child from the left is A_i. - 题解

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题目信息
题号 P21372
标题 [AtCoder] There are N children standing in a line from left to right. The activeness of the i-th child from the left is A_i.
难度 普及
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