Happy Number LeetCode | Java Code | Programming Tutorials

Published: 03 April 2020
on channel: Programming Tutorials

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In this tutorial, I have explained Happy Number LeetCode Solution using java code. The tricky part in this problem is to detect a loop.

Happy Number Java Code - https://webrewrite.com/happy-number/

LeetCode 30 Day Challenge PlayList - • Move Zeroes LeetCode | Move Zeroes to End ...

Write a code to determine if a number is "happy" or not.

In this tutorial, I have explained how to check whether an input number is happy number or not.

What is happy number?
Starting with any positive integer, replace the number by the sum of the squares of its digits, and 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 numbers.

Example 1:

Input : 19
output : true

1^2 + 9^2 = 82

8^2 + 2^2 = 68

6^2 + 8^2 = 100

1^2 + 0^2 + 0^2 = 1

Example 2:

Input : 20
Output : false

2^2 + 0^2 = 4

4^2 = 16

1^2 + 6^2 = 37

3^2 + 7^2 = 58

5^2 + 8^2 = 145

1^2 + 4^2 + 5^2 = 42

4^2 + 2^2 = 20 (Loop occurs)

This problem is the day 2 challenge of LeetCode 30 day challenge.

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