[AtCoder] We have N dice arranged in a line from left to right. The i-th die from the left shows p_i numbers from 1 to p_i with equal probability when thrown. - 题解

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题目信息
题号 P20450
标题 [AtCoder] We have N dice arranged in a line from left to right. The i-th die from the left shows p_i numbers from 1 to p_i with equal probability when thrown.
难度 普及
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