Add Digits
Explore how to reduce any integer to a single digit by repeatedly summing its digits. Understand the problem constraints, and discover a formula-based method to solve it in constant time without using loops or recursion.
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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