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Add code for leetcode 977 and update README.md.

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`@@ -23,6 +23,10 @@ Python 玩转 LeetCode 的学习之路`
`23`	`23`
`24`	`24`	`- [LeetCode面试系列第10天:No.976 - 三角形的最大周长](http://www.justdopython.com/2019/11/20/leetcode976-largest-perimeter-triangle/)`
`25`	`25`
	`26`	`+- [LeetCode面试系列第12天:No.977 - 有序数组的平方](http://www.justdopython.com/2019/11/25/python-leetcode977-squares-of-a-sorted-array/)`
	`27`	`+`
	`28`	`+- [LeetCode面试系列第11天:No.645 - 错误的集合](http://www.justdopython.com/2019/11/25/python-leetcode645-set-mismatch/)`
	`29`	`+`
`26`	`30`
`27`	`31`	`关注公众号:python技术,回复"python"一起学习交流`
`28`	`32`

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`@@ -0,0 +1,13 @@`
	`1`	`+from typing import List`
	`2`	`+`
	`3`	`+class Solution:`
	`4`	`+ def sortedSquares(self, A: List[int]) -> List[int]:`
	`5`	`+ B = sorted(A, key = abs) # sort by absolute values`
	`6`	`+ res = list()`
	`7`	`+ for elem in B:`
	`8`	`+ res.append(elem*elem)`
	`9`	`+ return res`
	`10`	`+`
	`11`	`+# below is testing`
	`12`	`+sol = Solution()`
	`13`	`+print(sol.sortedSquares([-4,-2, 3,6]))`

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