Happy Number
Updated Feb 24, 2026
Problem
Determine if n is a happy number.
Constraints
1 <= n <= 2^31 - 1
Examples
Example 1
Input:
{"n": 19}
Output:
true
Function Signature
def isHappy(self, n: int) -> bool
How to Submit
Implement a Solution class with a isHappy method.
Your method will be called with the input parameters and should return the answer.