求大牛

tyvj的P1030乳草的入侵
谁给下输入的思路
我在输入上丢了2个点
最后一个字符读入不正确

#include<stdio.h>
#include<string.h>
#define MAXN 101
int vis[MAXN][MAXN];
int d[MAXN][MAXN];
struct GRASS{int x,y;}q[MAXN*MAXN];
int tail=0,head=0;
void enq(int x,int y)
{
     q[tail].x=x,q[tail].y=y;
     tail++;
     return;
}
int deq()
{
     int key=head;
     head++;
     return key;
}
const int nx[8]={-1,-1,-1,0,0,1,1,1};
const int ny[8]={-1,0,1,-1,1,-1,0,1};
int bfs(int x0,int y0)
{
     int week=-1;
     int newx,newy,key,i;
     int x,y;
     vis[x0][y0]=0;
     d[x0][y0]=0;
     enq(x0,y0);
     while(head<tail)
     {
         key=deq();
         x=q[key].x,y=q[key].y;
         for(i=0;i<8;i++)
         {
             newx=x+nx[i];
             newy=y+ny[i];
             if(newx>0&&newy>0&&vis[newx][newy]==1)
             {
                 vis[newx][newy]=0;
                 d[newx][newy]=d[x][y]+1;
                 if(d[newx][newy]>week) week=d[newx][newy];
                 enq(newx,newy);
             }
         }
         vis[q[key].x][q[key].y]=-1;
     }
     return week;
}
int main()
{
     memset(vis,-1,sizeof(vis));
     memset(d,-1,sizeof(d));
     tail=0,head=0;
     int x,y,x0,y0,week;
     int i,j;
     char grass;
     scanf("%d%d%d%d",&y,&x,&y0,&x0);
     for(i=x;i>0;i--)
     for(j=1;j<=y;j++)
     {
         scanf("%c",&grass);
         if(grass=='.') vis[i][j]=1;
     }
     week=bfs(x0,y0);
     printf("%d",week);
     return 0;
}