[swift] LeetCode 21. Merge Two Sorted Lists

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.

func mergeTwoLists(_ l1: ListNode?, _ l2: ListNode?) -> ListNode? {var arr = [Int](), p1 = l1, p2 = l2, r = l1while let q1 = p1, let q2 = p2 {if q1.val < q2.val {arr.append(q1.val)p1 = q1.next} else {arr.append(q2.val)p2 = q2.next}}while let q1 = p1 {arr.append(q1.val)p1 = q1.nextif p1 == nil {q1.next = l2r = l1}}while let q2 = p2 {arr.append(q2.val)p2 = q2.nextif p2 == nil {q2.next = l1r = l2}}p1 = rarr.forEach {p1?.val = $0p1 = p1?.next}return r
}

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