832. Flipping an Image

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class Solution:     def flipAndInvertImage(self, A: List[List[int]]) -> List[List[int]]:         for a in A:             first = 0             last = len(a)-1             while first<last:                 a[first],a[last]=1-a[last],1-a[first]                 first += 1                 last -= 1             if len(a)&1 is 1:                 index = int((len(a)-1)/2)                 a[index] = 1-a[index]         return A

　　48ms,13.1M

优化一：

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class Solution:     def flipAndInvertImage(self, A: List[List[int]]) -> List[List[int]]:         return [[1-row[i] for i in range(len(row)-1,-1,-1)] for row in A]

　　48ms,13.2M