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# Write an algorithm to determine if a number n is happy. # A happy number is a number defined by the following process: # Starting with any positive integer, replace the number by the sum of the squares of its digits. # Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. # Those numbers for which this process ends in 1 are happy. # Return true if n is a happy number, and false if not. # Example 1: # Input: n = 19 # Output: true # Explanation: # 1^2 + 9^2 = 82 # 8^2 + 2^2 = 68 # 6^2 + 8^2 = 100 # 1^2 + 0^2 + 0^2 = 1 # Example 2: # Input: n = 2 # Output: false
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Principal Engineer

Interviewed at Gemini

3★
Sep 5, 2024

# Write an algorithm to determine if a number n is happy. # A happy number is a number defined by the following process: # Starting with any positive integer, replace the number by the sum of the squares of its digits. # Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. # Those numbers for which this process ends in 1 are happy. # Return true if n is a happy number, and false if not. # Example 1: # Input: n = 19 # Output: true # Explanation: # 1^2 + 9^2 = 82 # 8^2 + 2^2 = 68 # 6^2 + 8^2 = 100 # 1^2 + 0^2 + 0^2 = 1 # Example 2: # Input: n = 2 # Output: false

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