“多重组” & “多重映射” - 重点是什么？ [英] "multiset" & "multimap" - What's the point?

问题描述

正如问题所述...我不了解 multiset / multimap 的。

解决方案

有些用例：

p>

multimap

• 以邮政编码为键，所有拥有该邮政编码的人


• 以帐户ID为键，该人/帐户的所有打开订单


• 一个字典，说明
具有键和整数计数的地图。





• 商店的库存，所有产品都有自己的钥匙和金额
  仍然可用的是


• 商店的累积销售数据的值。每次销售产品时，将
  产品id get添加到multiset，从而增加销售量





As the question states ... I don't get the point about multisets / multimaps.

So, what's the purpose?

解决方案

Some use cases:

multimap

• With ZIP code as a key, all people which have that ZIP code
• With account ID as key, all open orders of that person/account
• A dictionary, with per keyword various explanations

multiset

is in essence a map with a key and a integer count.

• The inventory of a shop, all products have their key and the amount still available is the value
• accumulated sales data of a shop, every time a product is sold the product id get's added to the multiset thereby increasing the amount sold

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