leetcode 138. Copy List with Random Pointer

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题目链接：leetcode

思路：
遍历原链表，生成新链表

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# Definition for singly-linked list with a random pointer.
# class RandomListNode(object):
#     def __init__(self, x):
#         self.label = x
#         self.next = None
#         self.random = None

class Solution(object):
    def copyRandomList(self, head):
        """
        :type head: RandomListNode
        :rtype: RandomListNode
        """
        if not head:
            return None
        
        p = head
        newhead = q = RandomListNode(head.label)
        
        while p:
            q.next = None if not p.next else RandomListNode(p.next.label)
            q.random = None if not p.random else RandomListNode(p.random.label)
            p = p.next
            q = q.next
        return newhead