Package g0201_0300.s0258_add_digits

Class Solution

java.lang.Object
g0201_0300.s0258_add_digits.Solution
public class Solution extends java.lang.Object
258 - Add Digits.

Easy

Given an integer num, repeatedly add all its digits until the result has only one digit, and return it.

Example 1:

Input: num = 38

Output: 2

Explanation:

 The process is
 38 --> 3 + 8 --> 11
 11 --> 1 + 1 --> 2
 Since 2 has only one digit, return it.

Example 2:

Input: num = 0

Output: 0

Constraints:

  • 0 <= num <= 231 - 1

Follow up: Could you do it without any loop/recursion in O(1) runtime?

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    addDigits(int num)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • addDigits

      public int addDigits(int num)