给我一个实用的情况下多集 [英] Give me a practical use-case of Multi-set

问题描述

我想知道一些实际的用例（如果他们不相关/绑定到任何编程语言，它会更好）。我可以关联集，列表和地图到实际的用例。

I would like to know a few practical use-cases (if they are not related/tied to any programming language it will be better).I can associate Sets, Lists and Maps to practical use cases.

例如，如果您想要一本书的词汇表，其中您想要的术语按字母顺序列出，并且位置/页面编号是该值，则可以使用集合TreeMap OrderedMap是一个地图）

For example if you wanted a glossary of a book where terms that you want are listed alphabetically and a location/page number is the value, you would use the collection TreeMap(OrderedMap which is a Map)

不知怎的，我不能将MultiSets与任何实用用例程序相关联。有人知道有任何用途吗？

Somehow, I can't associate MultiSets with any "practical" usecase. Does someone know of any uses?

http： //en.wikipedia.org/wiki/Multiset 不足够告诉我）

PS：如果你们认为这应该是community-wiki ed是好的。

PS: If you guys think this should be community-wiki'ed it is okay. The only reason I did not do it was "There is a clear objective way to answer this question".

推荐答案

很多应用程序。例如，想象一个购物车。它可以包含一个项目的多个实例 - 即2个cpu的，3个图形板等。因此它是一个多集。一个简单的实现是跟踪每个项目的数量 - 即保持信息2 cpu的，3个图形板等。

Lots of applications. For example, imagine a shopping cart. That can contain more than one instance of an item - i.e. 2 cpu's, 3 graphics boards, etc. So it is a Multi-set. One simple implementation is to also keep track of the number of items of each - i.e. keep around the info 2 cpu's, 3 graphics boards, etc.

我相信你可以想到很多其他应用程序。

I'm sure you can think of lots of other applications.

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