std::unordered_set In C++

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NOTES:
0. Unordered Set is a associative container that contains set of 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, since once a hash is computed,
it refers to the exact bucket the element is placed into.

WHY UNORDERED SET?
0. maintain a collection of unique items with fast insertion and removal.

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