题目描述
输入两个单调递增的链表，输出两个链表合成后的链表，当然我们需要合成后的链表满足单调不减规则。
思路
新开个链表，按大小存储即可
class ListNode:
def __init__(self, x):
self.val = x
self.next = None
def Merge(pHead1, pHead2):
# write code here
res = ListNode(0)
head = res
while pHead1 and pHead2:
if pHead1.val <= pHead2.val:
head.next = pHead1
head = head.next
pHead1 = pHead1.next
else:
head.next = pHead2
head = head.next
pHead2 = pHead2.next
if pHead1:
head.next = pHead1
if pHead2:
head.next = pHead2
return res.next