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202-happy-number.md Removed unrelated example.

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Original file line number	Diff line number	Diff line change
`@@ -25,20 +25,12 @@`
`25`	`25`	```
`26`	`26`
`27`	`27`	`###[示例 2]`
`28`		-输入:`k = 2, prices = [3,2,6,5,0,3]`
	`28`	+输入:`n = 2`
`29`	`29`
`30`		-输出:`7`
`31`		`-`
`32`		`-解释:`
`33`		-```
`34`		`-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 。`
`35`		`-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 。`
`36`		-```
	`30`	+输出:`false`
`37`	`31`
`38`	`32`	`###[约束]`
`39`		--`1 <= k <= 100`
`40`		--`1 <= prices.length <= 1000`
`41`		--`0 <= prices[i] <= 1000`
	`33`	+-`1 <= n <= 2**31 - 1`
`42`	`34`
`43`	`35`	`##思路`
`44`	`36`	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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