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Grokking the Coding Interview Patterns in C#

Happy Number

Explore how to implement an algorithm to determine if a number is happy by repeatedly summing the squares of its digits. Understand using the fast and slow pointers approach to detect cycles and return true for happy numbers or 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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