在code::blocks中用c做出来的，但提交总是编译出错，请高手见教，以下是源代码：
#include<stdio.h>
#include<string.h>
#define max 65536

unsigned short int ini;
unsigned short int handle[]=
{
    0xc800,0xe400,0x7200,0x3100,
    0x8c80,0x4e40,0x2720,0x1310,
    0x08c8,0x04e4,0x0272,0x0131,
    0x008c,0x004e,0x0027,0x0013
};
void fun()
{
    if(ini==0x0000||ini==0xffff)
    {
        printf("0\n");
        return ;
    }
    unsigned short int queen[max];
    int fpos=-1,epos=0;
    short int step[max];
    queen[0]=ini;
    memset(step,-1,max);
    step[ini]=0;

    while(fpos<=epos)
    {
        fpos++;
        unsigned short int x=queen[fpos];
        int i;
        for(i=0; i<16; i++)
        {
            unsigned short int next=x^handle[i];
            if(step[next]==-1)
            {
                epos++;
                queen[epos]=next;
                step[next]=step[x]+1;
            }
            if(next==0x0000||next==0xffff)
            {
                printf("%d\n",step[next]);
                return ;
            }
        }
    }
    printf("Impossible\n");
    return ;
}

int main()
{
    int i,j;
    ini=0;
    for(i=0; i<4; i++)
    {
       char c;
        for(j=0; j<4; j++)
        {
            scanf("%c",&c);
            ini<<=1;
            if(c=='b')ini++;
        }
        scanf("%c",&c);
    }
    //printf("%d",ini);
    fun();
    return 0;
}