행렬의 곱셈

function solution(arr1, arr2) {
  let arr = [];

  for (let i = 0; i < arr1.length; i++) {
    let result = [];
    for (let j = 0; j < arr2[0].length; j++) {
      let an = 0;
      for (let k = 0; k < arr2.length; k++) {
        an += arr1[i][k] * arr2[k][j];
      }
      result.push(an);
    }
    arr.push(result);
  }
  return arr;
}