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/**
 * 2019/11/30
 * similar to lc. 88
 * review needed
 *
 *
 *
 * Definition for singly-linked list. 
 * public class ListNode { int val; ListNode next; 
 * ListNode(int x) { val = x; } }
 */
class Solution {

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