Question

I m reading the William Pugh s paper about skip-list. In section Initialization he says:

An element NIL is given a key greater than any legal key. All levels of all skip lists are terminated with NIL. A new list is initialized so that the level of the list is equal to 1 and all forward pointers of the list’s header point to NIL.

I m not sure of what he says. I think that he means: Let be n the maximum permitted level for each node. So build an header of level n. In a first step each level of the header points to NIL. It s right?

如今,当第一场节点到达时,将以一种有利于团结的方式加以插入,因此其程度不应预测。他为什么谈一级名单? 失踪的人是什么?

最佳做法

MC

Answer 1

我可以读到该文件,但如果我正确回顾,那么,NIL是清单中的一项内容,而其level大于任何有效的level,以确保其始终是最后一个项目。请允许我说,您的级别从1到3,然后请将NILs的级别改为4。当你制定一份新的履历清单时,它就应当这样做:

H = Header
N = Nil
   _    _
4 |H|->|N| 
3 |H|->|N| <- max for normal elements
2 |H|->|N|
1 |H|->|N|

在你补充了几个要素之后,你:

   _                   _
4 |H|---------------->|N| 
3 |H|-------|B|------>|N|
2 |H|-------|B|->|C|->|N|
1 |H|->|A|->|B|->|C|->|N|

Answer 2

空缺名单(新名单)应有级别 1. 导言插入期间(以后)需要增加更多数量。

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