## Question

Given an `m x n`

matrix of **distinct **numbers, return *all lucky numbers in the matrix in any order*.

A **lucky number** is an element of the matrix such that it is the minimum element in its row and maximum in its column.

**Example 1:**

Input:matrix = [[3,7,8],[9,11,13],[15,16,17]]Output:[15]Explanation:15 is the only lucky number since it is the minimum in its row and the maximum in its column.

**Example 2:**

Input:matrix = [[1,10,4,2],[9,3,8,7],[15,16,17,12]]Output:[12]Explanation:12 is the only lucky number since it is the minimum in its row and the maximum in its column.

**Example 3:**

Input:matrix = [[7,8],[1,2]]Output:[7]Explanation:7 is the only lucky number since it is the minimum in its row and the maximum in its column.

**Constraints:**

`m == mat.length`

`n == mat[i].length`

`1 <= n, m <= 50`

`1 <= matrix[i][j] <= 10`

.^{5}- All elements in the matrix are distinct.

## Python Solution

class Solution: def luckyNumbers (self, matrix: List[List[int]]) -> List[int]: min_ = {min(each) for each in matrix} max_ = {max(row)for row in zip(*matrix)} return (list(min_&max_))