#include "stdio.h"
main()
{int a[20][20];
 int i,j,n,x,y,x1,y1,n1,sum;
 printf("请你输入n:");
 scanf("%d",&n);
 n1=n; sum=n; x=0; y=1; x1=1; y1=0;
 for (i=1;i<=n*n;i++)
    {   x=x+x1;y=y+y1;a[x][y]=i ;  
     if (i==sum)
          {  if(x1==1 || x1==-1 )
               { n1=n1-1;
                 sum=sum+n1;
                 y1=x1;
                 x1=0;
                }
              else
                {sum=sum+n1;
                 x1=-y1;
                 y1=0;
                }
           }
      }
  for (i=1;i<=n;i++)
     {  for (j=1;j<=n;j++)
         printf(" %3d",a[j][i]);
        printf("\n");
     }
    return 0;