蛇形填数

描述在n*n方陈里填入1,2,...,n*n,要求填成蛇形。例如n=4时方陈为：
10 11 12 1
9 16 13 2
8 15 14 3
7 6 5 4

输入

直接输入方陈的维数，即n的值。(n<=100)

输出

输出结果是蛇形方陈。

样例输入

样例输出

7 8 1
6 9 2
5 4 3

 1 import java.util.Scanner;
 2 
 3 public class Main {
 4     public static void main(String[] args) {
 5         Scanner scanner=new Scanner(System.in);
 6         int n;
 7         int flag[][]=new int[101][101];
 8         int i;
 9         int j;
10         int count;
11         String direction;
12         
13         n=scanner.nextInt();
14         
15         for(i=0;i<n;i++){
16             for(j=0;j<n;j++)
17                 flag[i][j]=0;
18         }
19         
20         i=0;
21         j=n-1;
22         direction="south";
23         count=1;
24         
25         while(true){
26             flag[i][j]=count;
27             count++;
28 
29             if(direction.compareTo("south")==0){
30                 i++;
31                 
32                 if(i==n || flag[i][j]!=0){
33                     direction="west";
34                     i--;
35                     j--;
36                 }
37             }
38             
39             else if(direction.compareTo("west")==0){
40                 j--;
41                 
42                 if(j==-1 || flag[i][j]!=0){
43                     direction="north";
44                     j++;
45                     i--;
46                 }
47             }
48             
49             else if(direction.compareTo("north")==0){
50                 i--;
51                 
52                 if(i==-1 || flag[i][j]!=0){
53                     direction="East";
54                     i++;
55                     j++;
56                 }
57             }
58             
59             else if(direction.compareTo("East")==0){
60                 j++;
61                 
62                 if(j==n || flag[i][j]!=0){
63                     direction="south";
64                     j--;
65                     i++;
66                 }
67             }
68             
69             if(count==n*n+1)
70                 break;
71         }
72         
73         for(i=0;i<n;i++){
74             for(j=0;j<n;j++)
75                 System.out.print(flag[i][j]+" ");
76         
77             System.out.println();
78         }
79     }
80 }