LeetCode 832 Flipping an Image (Python)

题目

Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image.

To flip an image horizontally means that each row of the image is reversed. For example, flipping [1, 1, 0] horizontally results in [0, 1, 1].

To invert an image means that each 0 is replaced by 1, and each 1 is replaced by 0. For example, inverting [0, 1, 1] results in [1, 0, 0].

解题思路

对于每行中的第i个位置，与-(i+1)=~i，位置进行交换，与1进行异或，进行翻转

代码

class Solution:
    def flipAndInvertImage(self, A: List[List[int]]) -> List[List[int]]:
        for row in A:
            for i in range((len(row) + 1) // 2):
                row[i], row[~i] = row[~i] ^ 1, row[i] ^ 1
        return A

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