hdu 2091输出感觉完全一样，但是却显示WA

#include
void sanjiao (char, int);
int main(void)
{

int n;
char ch;

while (scanf("%c", &ch) != EOF)
{
    if (ch == '@')
    {
        break;
    }
    else
    {
        scanf("%d", &n);
        sanjiao(ch,n);
    }

}

return 0;

}
void sanjiao (char ch, int n)
{

int i, j, k=1, x, y, z, m;
char  c;
    if (k)
        k=0;
    else
        putchar('\n');


    for (i=1; i<=n-1; i++)
        putchar(' ');
    putchar(ch);
    putchar('\n');

    for (z=1; z<=n-2; z++)
    {

        for (x=z; x<=n-2;x++)
            putchar(' ');
        putchar(ch);
        for (y=1; y<2*z; y++)
            putchar(' ');
        putchar(ch);
        putchar('\n');
    }

    for (m=2*n-1;m>0; m--)
        putchar(ch);
    while (c=getchar()!='\n');
    putchar('\n');

}

http://blog.csdn.net/xujinsmile/article/details/7856380