Add Digits
Total Accepted: 5383 Total Submissions: 11876Given a non-negative integer num
, repeatedly add all its digits until the result has only one digit.
For example:
Given num = 38
, the process is like: 3 + 8 = 11
,
1 + 1 = 2
. Since 2
has only one digit, return it.
Follow up:
Could you do it without any loop/recursion in O(1) runtime?
[思路]
[CODE]
public class Solution { public int addDigits(int num) { return 1 + (num-1) % 9; } }