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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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