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chore: clarify collections documentation 

C++ `map` is more like BTreeMap.

`unordered_map` in C++(11) is the equivalent of `HashMap` in Rust.
(+ additional like for references).
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Pascal H 2021-03-15 09:14:12 +01:00 committed by GitHub
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exercises/collections/README.md
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@ -14,7 +14,7 @@ structures that are used very often in Rust programs:
* A *vector* allows you to store a variable number of values next to
each other.
* A *hash map* allows you to associate a value with a particular key.
You may also know this by the names *map* in C++, *dictionary* in
Python or an *associative array* in other languages.
You may also know this by the names [*unordered map* in C++](https://en.cppreference.com/w/cpp/container/unordered_map),
[*dictionary* in Python](https://docs.python.org/3/tutorial/datastructures.html#dictionaries) or an *associative array* in other languages.
[Rust book chapter](https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)