leetcode\SwapNodesInPairs::swapPairs()

Complexity

Conditions	3
Paths	2

Size

Total Lines	14
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

<?php
    public static function swapPairs(ListNode $head): ListNode
    {
        $dummy = new ListNode();
        $dummy->next = $head;
        $curr = $dummy;

        while (($a = $curr->next) && ($b = $curr->next->next)) {
            $a->next = $b->next;
            $curr->next = $b;
            $curr->next->next = $a;
            $curr = $curr->next->next;
        }

        return $dummy->next;
    }