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<?php
declare(strict_types=1);
namespace leetcode;
use leetcode\util\ListNode;
class ReverseLinkedList
{
public static function reverseList(?ListNode $head): ?ListNode
if (!$head) {
return null;
}
$node = null;
while ($head) {
$curr = $head;
$head = $head->next;
$curr->next = $node;
$node = $curr;
return $node;
public static function reverseList2(?ListNode $head): ?ListNode
if ($head === null || $head->next === null) {
return $head;
$node = self::reverseList($head->next);
$head->next->next = $head;
$head->next = null;
imajinyun /
leetcode-php
