Cleanest Java Iterative Solution


  • 0
    A
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        
        ListNode dummy = new ListNode(0);
        ListNode cur = dummy;
        while(l1 != null && l2 != null) {
            if(l1.val < l2.val) {
                cur.next = l1;
                l1 = l1.next;
            } else {
                cur.next = l2;
                l2 = l2.next;
            }
            cur = cur.next;
        }
        
        if(l1 != null) {
            cur.next = l1;
        }
        if(l2 != null) {
            cur.next = l2;
        }
        return dummy.next;
    }

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