C++ Solution to Leetcode 258. Add Digits
Problem statement
Given an integer num, repeatedly add all its digits until the result has only one digit, and return it.
Example 1
Input: num = 38
Output: 2
Explanation: The process is
38 --> 3 + 8 --> 11
11 --> 1 + 1 --> 2
Since 2 has only one di...
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