class Solution:    def flipAndInvertImage(self, A: List[List[int]]) -> List[List[int]]:        for a in A:            first = 0            last = len(a)-1            while first

　　48ms,13.1M

优化一：

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