void Read()
{    int i,j;char In[NUM];
    scanf("%d%d",&n,&m);
    for(i=0;i<=n+1;i++)
     for(j=0;j<=m+1;j++)Map[i][j]=1;
    for(i=1;i<=n;i++)
    { scanf("%s",In);
      for(j=1;j<=m;j++)
      { Map[i][j]=(In[j-1]=='*');
        if(!Map[i][j]){tx=i;ty=j;}
      }
    }
}
this Read() got AC
I think it's probably because the '\n' at the end of the line
try this change:

void Read()
{    int i,j;char ch;
    scanf("%d%d",&n,&m);
    for(i=0;i<=n+1;i++)
     for(j=0;j<=m+1;j++)Map[i][j]=1;
    for(i=1;i<=n;i++)
    { scanf("%c",&ch);
      for(j=1;j<=m;j++)
      { scanf("%c",&ch);
        Map[i][j]=(ch=='*');
        if(!Map[i][j]){tx=i;ty=j;}
      }
    }
}
I tested and both can AC this problem.