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Update 592._Fraction_Addition_and_Subtraction.md

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`@@ -101,3 +101,19 @@ class Solution(object):`
`101`	`101`	`return res`
`102`	`102`	```
`103`	`103`
	`104`	`+> 思路 2`
	`105`	`+****- 时间复杂度: O(N)**- 空间复杂度: O(N)****`
	`106`	`+`
	`107`	`+`
	`108`	`+我怕不是个智障吧,还小自豪,。。。。看了discuss里面[lee215](https://leetcode.com/problems/fraction-addition-and-subtraction/discuss/103387/Python-easy-understood-2-line-solution)大神的答案,我tm。。。。`
	`109`	+```python
	`110`	`+class Solution(object):`
	`111`	`+ def fractionAddition(self, expression):`
	`112`	`+ """`
	`113`	`+ :type expression: str`
	`114`	`+ :rtype: str`
	`115`	`+ """`
	`116`	`+ from fractions import Fraction`
	`117`	`+ res = sum(map(Fraction, expression.replace('+', ' +').replace('-', ' -').split()))`
	`118`	`+ return str(res.numerator) + '/' + str(res.denominator)`
	`119`	+```

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