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	`1`	`+/**`
	`2`	`+ * Example:`
	`3`	`+ * var li = ListNode(5)`
	`4`	+ * var v = li.`val`
	`5`	`+ * Definition for singly-linked list.`
	`6`	+ * class ListNode(var `val`: Int) {
	`7`	`+ * var next: ListNode? = null`
	`8`	`+ * }`
	`9`	`+ */`
	`10`	`+class Solution {`
	`11`	`+ fun swapPairs(head: ListNode?): ListNode? {`
	`12`	`+ val ret = head?.next`
	`13`	`+ ret ?: return head`
	`14`	`+`
	`15`	`+ var prev: ListNode? = null`
	`16`	`+ var odd: ListNode? = null`
	`17`	`+ var now = head`
	`18`	`+ while (now != null) {`
	`19`	`+ if (odd == null) {`
	`20`	`+ odd = now`
	`21`	`+`
	`22`	`+ now = now.next`
	`23`	`+ } else {`
	`24`	`+ prev?.next = now`
	`25`	`+ odd.next = now.next`
	`26`	`+ now.next = odd`
	`27`	`+`
	`28`	`+ now = odd.next`
	`29`	`+`
	`30`	`+ prev = odd`
	`31`	`+ odd = null`
	`32`	`+ }`
	`33`	`+ }`
	`34`	`+`
	`35`	`+ return ret`
	`36`	`+ }`
	`37`	`+}`

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