1 #include <stdio.h> 2 #include <string.h> 3 int a[103][103]; 4 int main() 5 { 6     int n; 7     while(~scanf("%d", &n)) 8     { 9         memset(a, 0, sizeof(a));10         int num = 1;11         int cnt = n * n;12         int i = 0, j = n - 1;13         a[0][n - 1] = 1;14         while (num < cnt)15         {16             while (i + 1 < n && a[i + 1][j] == 0)//向下填数 17                 a[++i][j] = ++num;18             while (j - 1 >= 0 && a[i][j - 1] == 0)//向左填数 19                 a[i][--j] = ++num;20             while (i - 1 >= 0 && a[i - 1][j] == 0)//向上填数 21                 a[--i][j] = ++num;22             while (j + 1 < n && a[i][j + 1] == 0)//向右填数 23                 a[i][++j] = ++num;24             25         }26         for (int i = 0; i < n; i++)27         {28             for (int j = 0; j < n; j++)29                 printf("%d ", a[i][j]);30             puts("");31         }32     }33     return 0;34 35 }