python学习笔记：用python合并两个排序链表
class Solution: def mergeTwoLists(self, l1: ListNode, l2: ListNode) -> ListNode: cur = dum = ListNode(0) while l1 and l2: if l1.val < l2.val: cur.next, l1 = l1, l1.next else: cur.next, l2 = l2, l2.next cur = cur.next cur.next = l1 if l1 else l2 return dum.next
