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Grokking the Coding Interview Patterns

Happy Number

Explore how to determine if a number is a happy number by repeatedly summing the squares of its digits. Understand using fast and slow pointer methods to detect cycles and avoid infinite loops. This lesson helps you implement an efficient algorithm to return true if a number is happy and false otherwise.

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Statement

Write an algorithm to determine if a number nn is a happy number.

We use the following process to check if a given number is a happy number:

  • Starting with the given number nn, replace the number with the sum of the squares of its digits.
  • Repeat the process until:
    • The number equals
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