Add Digits
Discover how to repeatedly sum an integer's digits until one digit remains and implement an efficient O(1) runtime solution without loops or recursion. This lesson helps you understand the problem constraints and apply mathematical insight to optimize digit addition.
We'll cover the following...
We'll cover the following...
Statement
Given an integer num, repeatedly sum all of its digits until the resulting value is a single digit, then return that value.
Note: Could you solve this without any loop or recursion in
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