[프로그래머스/자바] 정사각형으로 만들기

class Solution {
    public int[][] solution(int[][] arr) {
        int h = arr.length;
        int w = arr[0].length;
        
        int num = h > w ? h : w;
        
        int[][] answer = new int[num][num];
        
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr[0].length; j++) {
                answer[i][j] = arr[i][j];
            }
        }
        
        return answer;
    }
}