Nothing inherent in the algorithm says that if the last node was numbered 19, the next one will be numbered 20, yet in most common cases that is indeed the case.
算法中并没有指定如果上一个节点的号码是19，那么下一个的编号就是20，但大多一般情况下都是如此。
Nothing inherent in the algorithm says that if the last node was numbered 19, the next one will be numbered 20, yet in most common cases that is indeed the case.
算法中并没有指定如果上一个节点的号码是19，那么下一个的编号就是20，但大多一般情况下都是如此。
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