Street parade problem

1

#include<stdio.h>
#include<stdlib.h>
#include<strings.h>

struct node
{
int data;
struct node *next;
};
struct node *top=NULL;

void push(int pos)
{
struct node p;
p=(struct node)malloc(sizeof(struct node));

if(p==NULL)
printf("stack overflow\n");

else
{
    if(top==NULL)
    {
        p->data=pos;
        p->next=NULL;
        top=p;
    }
    else
    {
        p->data=pos;
        p->next=top;
        top=p;
    }
}

}

int pop()
{
struct node *p;
int x;

if(top==NULL)
{
    printf("stack is empty\n");
}
else
{
    p=top;
    top=top->next;
    x=p->data;
    free(p);
}
return x;

}

int stackTop()
{
if(top==NULL)
return 0;
else
return top->data;
}

int isEmpty()
{
if(top==NULL)
return 1;
else
return 0;

}

void display()
{
struct node *p=top;
while§
{
printf("%d\n",p->data);
p=p->next;
}
}

int main()
{
int n;
scanf("%d",&n);

int temp1=n;

int *a=(int *)malloc(n*sizeof(int));
a[0]=0;

int *b=(int *)malloc(n*sizeof(int));
b[0]=0;


int i=1;
int j=1;


for(int i=1;i<=n;i++)
{
    scanf("%d",&a[i]);
}

int zero;
scanf("%d",&zero);

/*for(int i=0; i<=n;i++)
printf("%d ",a[i]); 
printf("\n");*/

int x=1;

while(x!=temp1)
{
    if(stackTop()==x)
    {
        b[i]=pop();
        i++;
        x++;
    }
    else if(a[j]==x)
    {
        b[i++]=a[j++];
        x++;
    }
    else
    {
        push(a[j]);
        j++;
    }
    
}

//display();




while(!isEmpty())
{
    b[i++]=pop();
}

/*for(int i=0; i<=n;i++)
printf("%d ",b[i]);*/

for(int i=1; i<=n; i++)
{
    if(b[i]!=i)
    {printf("No");
    return 0;
    }
}
printf("Yes\n");
return 0;

}

…
The code works fine when i uncomment the boxes but is not working without those commands . why is it happening