Add Digits
Explore how to solve the Add Digits problem by repeatedly summing an integer's digits until a single digit remains. Learn to implement an efficient O(1) runtime solution without using loops or recursion, enhancing your problem-solving skills in coding interviews.
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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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