剑指offer复杂链表的复制python

# -*- coding:utf-8 -*-
# class RandomListNode:
#     def __init__(self, x):
#         self.label = x
#         self.next = None
#         self.random = None
class Solution:
    # 返回 RandomListNode
    def Clone(self, pHead):
        # write code here
        #扫2遍？
        if not pHead:
            return None
        #node 与 node之间映射
        nHead = RandomListNode(pHead.label)
        nCurrent = nHead
        pCurrent = pHead.next
        mapper = {}
        mapper[id(pHead)] = nHead
        mapper[id(None)] = None
        
        while pCurrent:
            node = RandomListNode(pCurrent.label)
            nCurrent.next = node
            nCurrent = nCurrent.next
            mapper[id(pCurrent)] = nCurrent
            pCurrent = pCurrent.next
        
        pCurrent = pHead
        nCurrent = nHead
        
        while pCurrent:
            nCurrent.random = mapper[id(pCurrent.random)]
            pCurrent = pCurrent.next
            nCurrent = nCurrent.next
        return nHead