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Which container can have the same keys?

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Which container can have the same keys?

(a) map

(b) multimap

(c) unordered map

(d) set

I got this question in an international level competition.

The above asked question is from More Containers topic in section Class Hierarchies, Library & Containers of C++

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The correct option is (b) multimap

To explain I would say: C++ provide multimap container that is used to make map that can contain same keys i.e. {a: 5} and {a:10} both can exist.

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