#1380 - Lucky Numbers in a Matrix

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Problem Description

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.

Solution

/**
 * @param {number[][]} matrix
 * @return {number[]}
 */
var luckyNumbers  = function(matrix) {
  const min = matrix.map(row => Math.min(...row));
  const max = matrix[0].map((_, i) => Math.max(...matrix.map(row => row[i])));

  return min.filter(value => max.includes(value));
};