Google Coding Interview Question - Happy Number (Cycle Detection) [LeetCode]

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Here is a step by step guide to the LeetCode problem Happy Number asked at Google.

This problem involves the use of Floyd's Cycle Finding Algorithm. The key idea behind the problem is we need to create nodes (which are integers) that have all their digits squared and summed up. If our tortoise pointer is equal to 1 by the end of finding a cycle, that means we have found a happy number!

TIMESTAMPS
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00:00:00 - problem description
00:01:31 - cycle detection algorithm walk through
00:04:36 - node generation walk through
00:08:26 - code walk through
00:12:10 - time/space complexity explanation