[프로그래머스/자바] 행렬의 덧셈

class Solution {
    public int[][] solution(int[][] arr1, int[][] arr2) {
        int[][] answer = arr1;
        for (int i = 0; i < arr1.length; i++) {
            for (int j = 0; j < arr1[0].length; j++) {
                answer[i][j] += arr2[i][j];
            }
        }
        
        return answer;
    }
}