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#include <iostream>
using namespace std;
struct node{
	int data;
struct node *link;
};
 
struct node* push(struct node *h,int n){
	struct node *temp=new node;
	struct node *first=h;
	for(int i=0;i<n;++i){
		int x;
		cin>>x;
		if(h==Null){
		h=temp;
		h->data=x;
		h=h->link;}
		else
		{
		h->data=x;
		h=h->link;
		}
 
	}
	h->link=Null;
	return first;
	}
 
 
void reverse(struct node *h,int k,int n){
	struct node *p=h;
struct node *q=h->link;
for(int i=0;i<n/2;++i){
	p->link=q->link;
	q=q->link;
	for(int i=0;i<k;++i){
		p=p->link;
		q=q->link;
	}
 
}}
void print(struct node *head){
	while(head!=Null){
	cout<<head->data<<" ";
	head=head->link;
}}
int main() {
	struct node *head;
head=Null;
int n,k;
cin>>n,k;
head=push(head,n);
reverse(head,k,n);
print(head);
 
	// your code goes here
	return 0;
}

prog.cpp: In function ‘node* push(node*, int)’:
prog.cpp:14:9: error: ‘Null’ was not declared in this scope
   if(h==Null){
         ^~~~
prog.cpp:25:10: error: ‘Null’ was not declared in this scope
  h->link=Null;
          ^~~~
prog.cpp: In function ‘void print(node*)’:
prog.cpp:43:14: error: ‘Null’ was not declared in this scope
  while(head!=Null){
              ^~~~
prog.cpp: In function ‘int main()’:
prog.cpp:49:6: error: ‘Null’ was not declared in this scope
 head=Null;
      ^~~~

Standard output is empty