std::unordered_map In C++ | STL C++

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In this video we will learn about std::unordered_map in c++ STL.

NOTES:
0. std::unordered_map is an associative container that contains key-value pairs with unique keys.
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_MAP
0. maintain a collection of uniqe {key:value} pairs with fast insertion and removal.

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