ModifyTheMatrix.java

// https://leetcode.com/problems/modify-the-matrix
class Solution {
    public int[][] modifiedMatrix(int[][] matrix) {
        for (int i = 0; i < matrix[0].length; i++) {
            int max = 0;
            for (int j = 0; j < matrix.length; j++) {
                max = Math.max(max, matrix[j][i]);
            }

            for (int j = 0; j < matrix.length; j++) {
                if (matrix[j][i] == -1) {
                    matrix[j][i] = max;
                }
            }
        }

        return matrix;
    }
}