Leetcode: lucky number in matrix

class Solution:
    def luckyNumbers (self, matrix: List[List[int]]) -> List[int]:
        #  Due to mn Very small , Direct simulation is good 
        ans = []
        m, n = len(matrix), len(matrix[0])
        for i in range(m):
            for j in range(n):
                #  Row minimum 
                if matrix[i][j] == min(matrix[i]):
                    #  Put the column in list in 
                    col = []
                    for k in range(m):
                        col.append(matrix[k][j])
                    if matrix[i][j] == max(col):
                        ans.append(matrix[i][j])
        return ans

summary ：
Random simulation