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Heyyo there my groovy reader,
I hope you’re excited about today’s problem. One of my subs was asked this question in their IBM software engineering interview. I thought about this question for quite a while, trying and testing different variants.
This problem can be found as problem 202. Happy Number on Leetcode.
Problem
Write an algorithm to determine if a number n
is happy.
A happy number is a number defined by the following process:
Starting with any positive integer, replace the number by the sum of the squares of its digits.
Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1.
Those numbers for which this process ends in 1 are happy.
Return true
if n
is a happy number, and false
if not.
Example 1:
Input: n = 19
Output: true
Explanation:
12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1
Example 2:
Input: n = 2
Output: false
Constraints:
1 <= n <= 231 - 1
You can test your solution here
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