package main

/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func sortList(head *ListNode) *ListNode {
	return nil
}

func mergeSort() {

}

func mergeList(l1, l2 *ListNode) *ListNode {
	dummy := &ListNode{}
	prev := dummy
	for l1 != nil && l2 != nil {
		if l1.Val < l2.Val {
			prev.Next = l1
			l1 = l1.Next
		} else {
			prev.Next = l2
			l2 = l2.Next
		}
		prev = prev.Next
	}
	if l1 != nil {
		prev.Next = l1
	} else {
		prev.Next = l2
	}
	return dummy.Next
}

func main() {
	l1 := toLinkedList([]int{
		3, 52, 6, 8, 4})
	printList(sortList(l1))
}