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Grokking the Coding Interview Patterns in C++

Happy Number

Explore how to determine if a number is happy by repeatedly summing the squares of its digits and using fast and slow pointers to detect cycles. Understand the algorithm to return true if the number reaches 1 or false if it enters a cycle. Practice implementing this in C++ to enhance your coding interview skills.

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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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