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Update Python刷题技巧笔记.md

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`@@ -165,6 +165,7 @@ but for larger y, the result is calculated using Exp(y * Log(x)).`
`165`	`165`
`166`	`166`	`sqrt()函数平常认为是O(lgn)的`
`167`	`167`	`但是追溯到最底层,sqrt()就是O(1)的,详细见`
	`168`	+```
`168`	`169`	`1. [求平方根sqrt()函数的底层算法效率问题](http://www.nowamagic.net/algorithm/algorithm_EfficacyOfFunctionSqrt.php)`
`169`	`170`	`2. [Time complexity of Math.Sqrt()?](https://stackoverflow.com/questions/34580158/time-complexity-of-math-sqrt)`
`170`		-```
	`171`	`+`

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