LeetCode 258: Add Digits Solution
Master LeetCode problem 258 (Add Digits), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
258. Add Digits
Problem Explanation
Explanation
To solve this problem without using loops or recursion in O(1) runtime, we can apply a mathematical formula based on the properties of digital roots. The digital root of a number is the result of repeatedly summing the digits of the number until a single-digit number is obtained.
The digital root of a number num can be calculated using the formula:
dr(num) = 1 + ((num - 1) % 9)
Solution Code
class Solution {
public int addDigits(int num) {
if (num == 0) {
return 0;
}
return 1 + ((num - 1) % 9);
}
}Try It Yourself
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