题解 | #牛牛的矩阵相加#

list1 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

n = int(input())

for i, sublist in enumerate(list1):
    for j, value in enumerate(sublist):
        list1[i][j] = value * n

print(list1)