剑指offer-包含min函数的栈-栈和队列-python

# -*- coding:utf-8 -*-
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
class Solution:
    # 返回合并后列表
    def Merge(self, pHead1, pHead2):
        # write code here
        if not pHead1:
            return pHead2
        if not pHead2:
            return pHead1
        if pHead1.val <= pHead2.val:
            pHead1.next =  self.Merge(pHead1.next,pHead2)
            return pHead1
        else:
            pHead2.next =  self.Merge(pHead1,pHead2.next)
            return pHead2