1380. Lucky Numbers in a Matrix

https://leetcode.com/problems/lucky-numbers-in-a-matrix

Description

Given a m * 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]

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.

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