有如下Python程序段:
n=4 a=[[i*n+j+1 for j in range(n)]for i in range(n)] for i in range(n//2): for j in range(1,n,2): a[i][j],a[n-i-1][n-j-1]=a[n-i-1][n-j-1],a[i][j]
则程序执行后,a[1][1]和a[2][0]的值分别是?
6和9
8和9
11和9
11和8