202. Happy Number [easy] (Python)

最新推荐文章于 2023-02-20 22:10:23 发布

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最新推荐文章于 2023-02-20 22:10:23 发布 · 7.5k 阅读

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#python #LeetCode

本文介绍了如何使用Python判断一个数字是否为Happy Number。Happy Number是一个数，在不断将数字的每一位平方和替换自身直到达到1的过程中形成的序列。文章提供了两种Python实现思路，包括使用字典记录已出现数字和应用弗洛伊德环检测算法，并附带了相关链接以供深入理解。

题目链接

https://leetcode.com/problems/happy-number/

题目原文

Write an algorithm to determine if a number 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, and 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 numbers.

Example: 19 is a happy number
$1^2 + 9^2 = 82$
82+22=68 <