Package g0201_0300.s0258_add_digits

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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:

    • <code>0 <= num <= 2<sup>31</sup> - 1</code>

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

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer addDigits(Integer num)

      • Methods inherited from class java.lang.Object

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