Merge Linked lists complete

NeetCodeRoadmap/LinkedLists/21_Merge_Two_Sorted_Lists.py

@@ -0,0 +1,21 @@
+def mergeTwoLists(l1, l2):
+    """
+    :type list1: Optional[ListNode]
+    :type list2: Optional[ListNode]
+    :rtype: Optional[ListNode]
+    """
+    dummy = ListNode()
+    tail = dummy
+    while l1 and l2:
+        if l1.val < l2.val:
+            tail.next = l1
+            l1 = l1.next
+        else:
+            tail.next = l2
+            l2 = l2.next
+        tail = tail.next
+    if l1:
+        tail.next = l1
+    elif l2:
+        tail.next = l2
+    return dummy.next