/**
* 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 $l1
* @param ListNode $l2
* @return ListNode
*/
function addTwoNumbers($l1, $l2) {$result=(is_null($l1)?0:$l1->val)+(is_null($l2)?0:$l2->val);
if($result>=10){
$result-=10;
if(is_null($l1->next)){$l1->next=new ListNode;}
$l1->next->val+=1;
}
$node=new ListNode($result);
if(is_null($l1->next) && is_null($l2->next)){return $node;}
$node->next=$this->addTwoNumbers($l1->next,$l2->next);
return $node;
}
}
集体博客:https://www.gwlin.com/posts/5717