std::unordered_multiset In C++ 

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In this video we will learn std::unordered_multiset in STL.
NOTES:
0. std::unordered_multiset is an associative container that contains set of possibly non-unique objects.
1. Search, insertion, and removal have average constant-time complexity.
2. Internally, the elements are organised into buckets.
3. It uses hashing to insert elements into buckets.
4. This allows fast access to individual elements, because after computing the hash of the value it refers to
the exact bucket the element is placed into.
WHY UNORDERED_MULTISET
0. maintain a collection of non-uniqe items with fast insertion and removal.
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