题解 | 矩阵转置

m,n=map(int,input().split())
matrix_old=[]
matrix_new=[ [] for i in range(n)]

for i in range(m):
    lst=list(map(int,input().split()))
    matrix_old.append(lst)

for i in range(m):
    for j in range(n):
        matrix_new[j].append(matrix_old[i][j])

for lst in matrix_new:
    for item in lst:
        print(item,end=" ")
    print()