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202 Happy Number
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README.md

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+ [199 Binary Tree Right Side View(层次遍历)](algorithms/BinaryTreeRightSideView)
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+ [200 Number of Islands(递归标记、搜索)](algorithms/NumberofIslands)
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+ [201 Bitwise AND of Numbers Range(位运算)](algorithms/BitwiseANDofNumbersRange)
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+ [202 Happy Number(环判断,模拟)](algorithms/HappyNumber)
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## Database
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algorithms/HappyNumber/README.md

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}
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```
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再根据提示,如果该数不是Happy的,则必然出现环,可以使用判断链表是否存在环的方法,设置快慢指针,若快的能和慢的相遇,则有环
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再根据提示,如果该数不是Happy的,则必然出现环,可以使用判断[链表是否存在环](../LinkedListCycle)的方法,设置快慢指针,若快的能和慢的相遇,则有环
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```cpp
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bool isHappy(int n) {

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