Day 24: More Linked Lists

https://www.hackerrank.com/challenges/30-linked-list-deletion/problem

<?php
class Node{
    public $data;
    public $next;
    function __construct($d)
    {
        $this->data = $d;
        $this->next = NULL;
    }
}
class Solution{

    function removeDuplicates($head){
        //Write your code here
        echo $head->data." ";
        while( $head != null ){
            if( $head->next != null && $head->data == $head->next->data ){
                $head->next = $head->next->next;
            } else {
                if( $head->next != null ){
                    $this->removeDuplicates($head->next);
                }
                break;
            }
        }
    }

    function insert($head,$data){
       //complete this method
       $p=new Node($data);
       if($head==null){
            $head=$p;
       }  
       else if($head->next==null){
            $head->next=$p;
       } 
       else{
            $start=$head;
            while($start->next!=null){
                    $start=$start->next;
            }
            $start->next=$p;
       } 
       return $head;
    }

    function display($head){
        $start=$head;
        while($start){
           echo $start->data,' ';
           $start=$start->next;
        }
    }
}
$T=intval(fgets(STDIN));
$head=null;
$mylist=new Solution();
while($T-->0){
    $data=intval(fgets(STDIN));
    $head=$mylist->insert($head,$data);
}
$head=$mylist->removeDuplicates($head);
$mylist->display($head);
?>