leetcode1380

 1 import sys
 2 class Solution:
 3     def luckyNumbers (self, matrix: List[List[int]]) -> List[int]:
 4         m = len(matrix)
 5         n = len(matrix[0])
 6         luckyset = set()
 7         result = []
 8         for i in range(m):
 9             min_row = sys.maxsize
10             for j in range(n):
11                 if matrix[i][j] < min_row:
12                     min_row = matrix[i][j]
13             luckyset.add(min_row)
14         for j in range(n):
15             max_col = 0
16             for i in range(m):
17                 if matrix[i][j] > max_col:
18                     max_col = matrix[i][j]
19             if max_col in luckyset:
20                 result.append(max_col)
21         return result