carloscn / carloscn/structstudy

leetcode258:各位相加(add-digits)

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Level-easy 一般问题 数学
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Description

### 问题描述

给定一个非负整数 num,反复将各个位上的数字相加,直到结果为一位数。返回这个结果。

示例 1:
输入: num = 38
输出: 2
解释: 各位相加的过程为:
38 --> 3 + 8 --> 11
11 --> 1 + 1 --> 2
由于 2 是一位数,所以返回 2。

示例 1:
输入: num = 0
输出: 0
 

提示:
0 <= num <= 231 - 1

来源:力扣(LeetCode)
链接:https://leetcode.cn/problems/add-digits

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