题解 | #矩阵乘法#

#令第一个矩阵为A，第二个矩阵为B
#A的行数为A_m，列数为A_n；B的行数为B_m，列数为B_n;
A_m = int(input())
A_n = B_m = int(input())
B_n = int(input())

#加载第一个矩阵
A = []
i = 0
while i < A_m:
    A.append([int(i) for i in input().split()])
    i += 1

#加载第二个矩阵
B = []
i = 0
while i < B_m:
    B.append([int(i) for i in input().split()])
    i += 1

#A与B相乘得矩阵C
#函数f(i,j)，表示矩阵C第i行，第j列的值。i,j都是索引,从0开始。
def f(i:int,j:int,A:list,B:list)->int:
    Ai = A[i]                 #A的第i行元素
    Bj = [i[j] for i in B]    #B的第j列元素
    result = 0
    for i in range(len(Ai)):
        result += Ai[i] * Bj[i]
    return result

C = [[f(i,j,A,B) for j in range(B_n)]for i in range(A_m)]
for i in C:
    for j in i:
        print(j,end=' ')
    print()