【剑指offer】面试题26：复制的复杂链条

 def copyRandomList(self, head):
        if None == head: return None
        phead = head
        while phead:
            pnext = phead.next
            phead.next = RandomListNode(phead.label)
            phead.next.next = pnext
            phead = pnext

        phead = head
        while phead:
            if phead.random:
                phead.next.random = phead.random.next
            phead = phead.next.next

        head2 = RandomListNode(-1)
        tail2 = head2
        phead = head
        while phead:
            tail2.next = phead.next
            phead.next = phead.next.next
            phead = phead.next
            tail2 = tail2.next
        return head2.next

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