3033 - Modify the Matrix.

Easy

Given a 0-indexed m x n integer matrix matrix, create a new 0-indexed matrix called answer. Make answer equal to matrix, then replace each element with the value -1 with the maximum element in its respective column.

Return the matrix answer.

Example 1:

Input: matrix = [1,2,-1,4,-1,6,7,8,9]

Output: [1,2,9,4,8,6,7,8,9]

Explanation: The diagram above shows the elements that are changed (in blue).

• We replace the value in the cell 1 with the maximum value in the column 1, that is 8.

• We replace the value in the cell 2 with the maximum value in the column 2, that is 9.

Example 2:

Input: matrix = [3,-1,5,2]

Output: [3,2,5,2]

Explanation: The diagram above shows the elements that are changed (in blue).

Constraints:

• m == matrix.length

• n == matrix[i].length

• 2 <= m, n <= 50

• -1 <= matrix[i][j] <= 100

• The input is generated such that each column contains at least one non-negative integer.