프로그래머스-행렬의곱셈

import java.util.*;

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