#include <iostream>
#include <string>
using namespace std;

class Node 
{
private:
   int item;
   Node *next;
public:
   Node();
   Node(int value);
   Node *getNext() const;
   void setNext(Node * nextPtr);
   int getItem() const;
   void setItem(int value);
};
Node::Node():item(0),next(nullptr)
{}

Node::Node(int value):item(value),next(nullptr)
{}

Node * Node::getNext() const
{
   return next;
}

void Node::setNext(Node * nextPtr)
{
   next = nextPtr;
}

int Node::getItem() const
{
   return item;
}

void Node::setItem(int value)
{
   item = value;
}

Node * partition(Node * headPtr,int x)
{
   Node * beforStart = nullptr;
   Node * afterStart = nullptr;
   while(headPtr != nullptr)
   {
      Node * nextNodePtr = headPtr->getNext();
      if(headPtr->getItem() < x)
      {
         headPtr->setNext(beforStart);
         beforStart = headPtr;
      }
      else
      {
         headPtr->setNext(afterStart);
         afterStart = headPtr;
      }
      headPtr = nextNodePtr;
   }

   if(beforStart == nullptr)
      return afterStart;
   Node * head = beforStart;
   while(head->getNext() != nullptr)
      head = head->getNext();
   head->setNext(afterStart);

   return beforStart;
  
}

void printNodeChain(Node * headPtr)
{
	while(headPtr != nullptr)
	{
		cout<<headPtr->getItem()<<" ";
		headPtr = headPtr->getNext();
	}
	cout<<endl;
}

int main()
{
	int arr[6] = {3,8,9,1,2,4};
	Node * headPtr = nullptr;
	for(int i = 0; i < 6; i++)
	{
		Node * nodePtr = new Node();
		nodePtr->setItem(arr[i]);
		nodePtr->setNext(headPtr);
		headPtr = nodePtr;
	}
	printNodeChain(headPtr);
	headPtr = partition(headPtr,5);
	printNodeChain(headPtr);
	return 0;

}