[프로그래머스][JS / Javascript] 행렬의 곱셈

https://school.programmers.co.kr/learn/courses/30/lessons/12949

프로그래머스

 

function solution(arr1, arr2) {
    let row = arr1.length;
    let col = arr2[0].length;
    let com = arr1[0].length;

    // 답배열 초기화
    let ans = [];
    for(let i=0; i<row; i++) {
        let tmp = [];
        for (let j=0; j<col; j++) {
            tmp.push(0);
        }
        ans.push(tmp);
    }

    // 연산
    for(let i=0; i<row; i++) {
        for(let j=0; j<col; j++) {
            for(let k=0; k<com; k++) {
                ans[i][j] += arr1[i][k] * arr2[k][j];
            }
        }
    }

    return ans;
}