C语言--老鼠走迷宫

#define SIZE  60
#define INCSIZE 40
typedef struct 
{
   int x;
   int y;
}stelem;

typedef struct
{
  stelem *base;
  stelem *top;
  int stacksize;
}sqstack;

int a[10][10]={0};
sqstack s;
int flag=0;

 initstack(sqstack *s)
{
   s->base=(stelem *)malloc(SIZE*sizeof(stelem));
   if(!s->base) exit(0);
   s->top=s->base;
   s->stacksize=SIZE;
}


void push(sqstack *s,stelem e)
{

   if(s->top - s->base >= s->stacksize)
       {
  s->base=(stelem *)realloc(s->base,(s->stacksize+INCSIZE)*sizeof(int));
  if(!s->base)exit(0);
  s->top=s->base + s->stacksize;
  s->stacksize+=INCSIZE;
       }
   s->top->x=e.x;
   s->top->y=e.y;
   s->top++;
}

 pop(sqstack *s ,stelem *e)
{  
   if(s->top==s->base){over();errorpath();bioskey(0);eraser2(4);exit(0); }
   s->top--;
   e->x= s->top->x;
   e->y= s->top->y;
}


assess(stelem e)
{
   stelem ab;
   int ma,na;
   clrscr();
   ma=e.x; na=e.y;  /*记录原坐标*/
   if(a[e.x][e.y]==3) return;
   if(!a[e.x][e.y]||a[e.x][e.y]==1)
    {