[AtCoder] There is a staircase with N steps. Takahashi is now standing at the foot of the stairs, that is, on the 0-th step. - 题解

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题目信息
题号 P14871
标题 [AtCoder] There is a staircase with N steps. Takahashi is now standing at the foot of the stairs, that is, on the 0-th step.
难度 普及-
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