程序代码：

#include<stdio.h>
int i,j;
int a[100][100];
void print(int n,int depth)
{
    if(n == depth)
    {
        a[n][n] = depth+1;
        return ;
    }
    for(i = depth;i<=n;i++)
        a[depth][i] = a[n][i] = depth+1;
    for(i = depth;i<=n;i++)
        a[i][depth] = a[i][n] = depth+1;          
    print(n-1,depth+1);
}
int main()
{
    int t;
    while(~scanf("%d", &t))
    {
        if(!(t&0x01))continue;
        print(t-1,0);
        for(i = 0;i<t;i++)
        {
            for(j = 0;j<t;j++)
                printf("%2d ",a[i][j]);
            printf("\n");
        }
    }
    return 0;
}

程序代码：

#include<stdio.h>
int i,j;
int a[100][100];
void print(int n,int depth)
{
    if(n+1 == depth)return ;
    if(n == depth)
    {
        a[n][n] = depth+1;
        return ;
    }
    for(i = depth;i<=n;i++)
        a[depth][i] = a[n][i] = depth+1;
    for(i = depth;i<=n;i++)
        a[i][depth] = a[i][n] = depth+1;          
    print(n-1,depth+1);
}
int main()
{
    int t;
    while(~scanf("%d", &t))
    {
        print(t-1,0);
        for(i = 0;i<t;i++)
        {
            for(j = 0;j<t;j++)
                printf("%2d ",a[i][j]);
            printf("\n");
        }
    }
    return 0;
}

程序代码：

#include <stdio.h>
#define MIN(a, b) ((a) < (b) ? a : b)

int min4(int a, int b, int c, int d) {
   int min = 0;
   min = MIN(a, b);
   min = MIN(min, c);
   min = MIN(min, d);
   return min;
}

int main(void) {
   int top, left, bottom, right, width, i, j;
   scanf("%d", &width);
   for (i = 0; i < width; ++i) {
      for (j = 0; j < width; ++j) {
         top    = i + 1;
         left   = j + 1;
         bottom = width - i;
         right  = width - j;
         printf("%-3d", min4(top, left, bottom, right));
      }
      printf("\n");
   }
   return 0;
}