#生成n*n的矩阵

import random

n=int(input(‘输入n，产生n*n的方阵：’ ))

a=[[random.randint(1,9) for i in range(n)] for j in range(n)]

for i in a:

  print(i)

print( )

x,y=[],[]

xy=input("请输入左上角+右下角坐标：") #输入左上角坐标+右下角坐标,用逗号分隔数字。如："2,1,14,13"

xy=xy+","

c,j=0,0

for i in range(len(xy)):

  if xy[i]==",":

    if :

      x.append(int(xy[j:i]))

    else:

      y.append(int(xy[j:i]))

    c=c+1

for i in range(y[0],y[1]+1,1):

  for j in range(x[0],(x[0]+x[1])//2+1,1):

    a[i][j],a[i][]=a[i][],a[i][j]

for i in range(len(a)):

  print(a[i])