学步园

import java.util.Scanner;
public class Test {
  // 输出蛇形的图案。(如下所示：)
  //  10 11 12 1 
  //  9  16 13 2 
  //  8  15 14 3 
  //  7  6  5  4
  */
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  
  int n = sc.nextInt();
  int array[][] = new int[n][n];
  for(int i=0;i<n;i++)
   for(int j=0;j<n;j++)
    array[i][j] = 0;
  int pos = 1;
  int x =0,y=n-1;
  array[x][y] = pos++;
  while(pos<=n*n)
  {
   //向下填充
   while(x+1<n && array[x+1][y]==0)
     array[++x][y] = pos++;
   //向左填充
   while(y-1>=0 && array[x][y-1]==0)
     array[x][--y] = pos++;
   //向上填充
   while(x-1>=0 && array[x-1][y]==0)
     array[--x][y] = pos++;
   //向右填充
   while(y+1<n && array[x][y+1]==0)
     array[x][++y] = pos++;
  }
  for(int i=0;i<n;i++)
  {
   for(int j=0;j<n;j++)
    System.out.print(array[i][j]+" ");
   System.out.println();
  }
 }
}