5844: k5-9-6 蛇形方阵2

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:0 Solved:0

Description

输入一个正整数n,生成一个n*n的蛇形方阵

Input

一行一个正整数n,1<=n<=20

Output

共n行,每行n个正整数,每个正整数占5列

Sample Input Copy

5

Sample Output Copy

15   7    6    2    1    
16   14   8    5    3    
22   17   13   9    4    
23   21   18   12   10   
25   24   20   19   11