leetcode Day27----array.easy

Flipping an Image

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].

Example 1:

Input: [[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: [[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]]
Notes:

1 <= A.length = A[0].length <= 20
0 <= A[i][j] <= 1

C语言

/**
 * Return an array of arrays of size *returnSize.
 * The sizes of the arrays are returned as *returnColumnSizes array.
 * Note: Both returned array and *columnSizes array must be malloced, assume caller calls free().
 */
int** flipAndInvertImage(int** A, int ASize, int* AColSize, int* returnSize, int** returnColumnSizes){
	*returnSize = ASize;
	int colsize = *AColSize;
	int** retarr = (int**)malloc(sizeof(void*) * ASize);
	*returnColumnSizes = (int*)malloc(sizeof(int) * ASize);
	for (int i = 0; i < ASize; i ++) {
		int* one = A[i];
		int* newone = (int*)malloc(sizeof(int) * colsize);
		for (int j = 0; j < colsize; j ++) {
			int t = one[j];
			if (t == 1) t = 0;
			else t = 1;
			newone[colsize - j - 1] = t;
		}
		retarr[i] = newone;
		(*returnColumnSizes)[i] = colsize;
	}
	return retarr;
}

Success
Details
Runtime: 20 ms, faster than 9.70% of C online submissions for Flipping an Image.
Memory Usage: 8.2 MB, less than 100.00% of C online submissions for Flipping an Image.

python3

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

Success
Details
Runtime: 48 ms, faster than 79.42% of Python3 online submissions for Flipping an Image.
Memory Usage: 12.9 MB, less than 5.63% of Python3 online submissions for Flipping an Image.