[프로그래머스] 행렬의 곱셈

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