mediumFast & Slow Pointers Pattern
Happy Number
A happy number is defined by the following process: - Starting with any positive integer, replace the number by the sum of the squares of its digits. - Repeat until the number equals 1 (happy), or loops endlessly in a cycle. Return `true` if n is a happy number, `false` otherwise.
Examples
Input:
n = 19Output:
trueExplanation: 1² + 9² = 82 → 8² + 2² = 68 → ... → 1
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