Leetcode - Flipping an Image Solution
Given an n x n
binary matrix image
, 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]
.
Example 1:
Input: image = [[1,1,0],[1,0,1],[0,0,0]]
Output: [[1,0,0],[0,1,0],[1,1,1]]
Explanation: First reverse each row: [[0,1,1],[1,0,1],[0,0,0]].
Then, invert the image: [[1,0,0],[0,1,0],[1,1,1]]
Example 2:
Input: image = [[1,1,0,0],[1,0,0,1],[0,1,1,1],[1,0,1,0]]
Output: [[1,1,0,0],[0,1,1,0],[0,0,0,1],[1,0,1,0]]
Explanation: First reverse each row: [[0,0,1,1],[1,0,0,1],[1,1,1,0],[0,1,0,1]].
Then invert the image: [[1,1,0,0],[0,1,1,0],[0,0,0,1],[1,0,1,0]]
Constraints:
n == image.length
n == image[i].length
1 <= n <= 20
images[i][j]
is either0
or1
.
Solution in Python
class Solution:
def flipAndInvertImage(self, A: List[List[int]]) -> List[List[int]]:
return [list(map(lambda x:(x+1)%2, reversed(arr))) for arr in A]