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Iterative.php
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Iterative.php
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<?php
/**
* Definition for a singly-linked list.
* class ListNode {
* public $val = 0;
* public $next = null;
* function __construct($val = 0, $next = null) {
* $this->val = $val;
* $this->next = $next;
* }
* }
*/
class Solution {
/**
* @param ListNode $list1
* @param ListNode $list2
* @return ListNode
*/
function mergeTwoLists($list1, $list2) {
$head = $newList = new ListNode ;
while($list1 != null || $list2 != null ){
if($list1->val <= $list2->val && $list1 || !$list2){
$newNode = new ListNode($list1->val);
$list1 = $list1->next ;
}
elseif($list2) {
$newNode = new ListNode($list2->val);
$list2 = $list2->next ;
}
if($newList) {
$newList->next = $newNode ;
$newList = $newList->next ;
}
}
return $head->next ;
}
}