current.next = l1
l1 = l1.next
else:
current.next = l2
l2 = l2.next
current = current.next
current.next = l1 if l1 else l2
return dummyHead.next
return l1 or l2
if __name__ == '__main__':
list_1 = ListNode.buildSortedList(2)
list_2 = ListNode.buildSortedList(3)
ListNode.show(list_1)
ListNode.show(list_2)
solution = Solution()
merged = solution.mergeTwoLists(list_1, list_2)
ListNode.show(merged)
# list_1 = ListNode.buildEmptyList()
# list_2 = ListNode.buildSortedList(1)
# ListNode.show(list_1)
# ListNode.show(list_2)
# solution = Solution()
# merged = solution.mergeTwoListsRefine(list_1, list_2)