Daily question -1380 Lucky number in matrix_ Python

• To give you one m * n Matrix , The number in the matrix Each are not identical . Please press arbitrarily Return all the lucky numbers in the matrix in order .

Lucky number refers to the elements in the matrix that meet the following two conditions at the same time ：

The smallest of all elements in the same row
The largest of all elements in the same column

Example 1：

Input ：matrix = [[3,7,8],[9,11,13],[15,16,17]]
Output ：[15]
explain ：15 Is the only lucky number , Because it is the smallest value in its row , It is also the maximum value in the column .

Example 2：

Input ：matrix = [[1,10,4,2],[9,3,8,7],[15,16,17,12]]
Output ：[12]
explain ：12 Is the only lucky number , Because it is the smallest value in its row , It is also the maximum value in the column .

Example 3：

Input ：matrix = [[7,8],[1,2]]
Output ：[7]

Tips ：

m == mat.length
n == mat[i].length
1 <= n, m <= 50
1 <= matrix[i][j] <= 10^5
All elements in the matrix are different

Program code

class Solution:
def luckyNumbers (self, matrix: List[List[int]]) -> List[int]:
ans = []
for i in matrix:
for j, x in enumerate(i):
if x == min(i) and x == max(k[j] for k in matrix):
ans.append(x)
return ans