原题
将两个排序链表合并为一个新的排序链表
样例
给出 1->3->8->11->15->null，2->null，
返回 1->2->3->8->11->15->null。
解题思路
- 基础链表操作，每次比较连个链表的头，把相对小的加入新链表
完整代码
# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution(object):
def mergeTwoLists(self, l1, l2):
"""
:type l1: ListNode
:type l2: ListNode
:rtype: ListNode
"""
dummy = ListNode(0)
current = dummy
while l1 != None and l2 != None:
if l1.val < l2.val:
current.next = l1
l1 = l1.next
else:
current.next = l2
l2 = l2.next
current = current.next
if l1 != None:
current.next = l1
else:
current.next = l2
return dummy.next
