#include?
#include?
#include?
#include

#define?size?1000
#define?color?4

typedef?struct
{
????int?xy;
}point;
typedef??struct
{
????point?*base*top;
????int?stackSize;
}stack;
void?initStack（stack?*s）
{
????s->stackSize=size;
????s->base=（point?*）malloc（sizeof（point）*s->stackSize）;
????if（!s->base）
????????printf（“init?stack?error!“）;
?????s->top=s->base;

}
int??getTop（stack?*spoint?*p）
{
????if（s->top==s->base）
????????return?0;
????p->x=（s->top-1）->x;
????p->y=（s->top-1）->y;
????return?1;
}

int?pop（stack?*spoint?*p）
{
????if（s->base==s->top）
????????return?0;
????s->top--;
????p->x=s->top->x;
????p->y=s->top->y;
????return?1;
}

int?push（stack?*spoint?*p）
{???point?*temp=NULL;
????if（s->top-s->base>=s->stackSize）
????????{
????????????temp=（point?*）realloc（s->basesizeof（point）*（s->stackSize+100））;
????????????if（!temp）
????????????????{
????????????????????printf（“memory?is?not?enough!\n“）;
????????????????????getch（）;
????????????????????exit（0）;
????????????????}
?????????????s->stackSize+=100;
?????????????s->top=（s->top-s->base）+temp;
?????????????s->base=temp;
????????}
?????s->top->x=p->x;
?????s->top->y=p->y;
?????s->top++;
?????return?1;

}



int?scan（stack?*s）
{
????int?up=1down=1;
????point?p?temp;
????while（pop（s&p）==1）
????????{
????????????while（getpixel（p.x+1p.y）==0）
????????????????p.x++;

????????????while（getpixel（p.xp.y）==0）
????????