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g1301_1400.s1380_lucky_numbers_in_a_matrix.readme.md Maven / Gradle / Ivy

1380\. Lucky Numbers in a Matrix

Easy

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] <= 105.
*   All elements in the matrix are distinct.