Programmers 행렬의 덧셈

def solution(arr1, arr2):
    n = len(arr1)
    m = len(arr1[0])
    for i in range(n):
        for j in range(m):
            arr1[i][j] += arr2[i][j]
    return arr1

def sumMatrix(A,B):
    answer = [[c + d for c, d in zip(a, b)] for a, b in zip(A,B)]
    return answer