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Grokking the Coding Interview Patterns in Python

Happy Number

Explore how to determine if a number is happy by repeatedly summing the squares of its digits. Understand the use of fast and slow pointer techniques to detect cycles and confirm whether the number eventually reaches one. This lesson helps you develop skills to solve cycle detection problems efficiently in coding interviews.

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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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