clueless coding // TODO: be smarter

LeetCode Merge Two Sorted Lists: Java Solution



TL;DR Code Solution


public ListNode mergeTwoLists(ListNode l1, ListNode l2) {

    ListNode dummy = new ListNode(0);
    ListNode runner = dummy;
    while (l1 != null && l2 != null) {
        if (l1.val <= l2.val) {
            runner.next = l1;
            l1 = l1.next;
        }
        else {
            runner.next = l2;
            l2 = l2.next;
        }
        runner = runner.next;
    }

    runner.next = l1 == null ? l2 : l1;

    return dummy.next;

}