[AtCoder] An integer N is a multiple of 9 if and only if the sum of the digits in the decimal representation of N is a multiple of 9. - 题解

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题目信息
题号 P21377
标题 [AtCoder] An integer N is a multiple of 9 if and only if the sum of the digits in the decimal representation of N is a multiple of 9.
难度 普及-
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