杭电2074

 1 #include<stdio.h>
 2 #include<string.h>
 3 char a[85][85];
 4 int main()
 5 {
 6     int n,k=0,i,j;
 7     char b,c,t;
 8     while(~scanf("%d %c %c",&n,&b,&c))
 9     {
10         if(k++)
11             printf("
");
12         if(n==1)
13             printf("%c
",b);
14         else
15         {
16             if(n%4==1)//判断外框字母
17             {
18                 t=b;
19                 b=c;
20                 c=t;
21             }
22             for(i=0; i<n/2+1; ++i)
23             {
24                 for(j=i; j<n-i; ++j)
25                     a[i][j]=a[n-1-i][j]=a[j][i]=a[j][n-1-i]=i%2?b:c;
26 
27             }
28             a[0][n-1]=a[0][0]=a[n-1][0]=a[n-1][n-1]=' ';
29             for(i=0; i<n; ++i)
30             {
31                 for(j=0; j<n; ++j)
32                     printf("%c",a[i][j]);
33                 printf("
");
34             }
35         }
36     }
37 }