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202-happy-number.md Removed unrelated example.
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zh/1-1000/202-happy-number.md

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```
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### [示例 2]
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**输入**: `k = 2, prices = [3,2,6,5,0,3]`
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**输入**: `n = 2`
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**输出**: `7`
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**解释**:
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```
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在第 2 天 (股票价格 = 2) 的时候买入,在第 3 天 (股票价格 = 6) 的时候卖出, 这笔交易所能获得利润 = 6-2 = 4 。
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随后,在第 5 天 (股票价格 = 0) 的时候买入,在第 6 天 (股票价格 = 3) 的时候卖出, 这笔交易所能获得利润 = 3-0 = 3 。
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```
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**输出**: `false`
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### [约束]
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- `1 <= k <= 100`
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- `1 <= prices.length <= 1000`
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- `0 <= prices[i] <= 1000`
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- `1 <= n <= 2**31 - 1`
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## 思路
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1. 递归调用`isHappy(n)`比较方便,每次只需要生成新的`n`作为参数。

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