Leetcode Problem 258. Add Digits

258. Add Digits

Leetcode Solutions

Mathematical: Digital Root

Check if the input number num is 0. If so, return 0 as the digital root.
If num is not 0, apply the digital root formula: 1 + (num - 1) % 9.
Return the result as the digital root of the input number.

Iterative Sum of Digits

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