The std::unordered_map::operator is a built in function in C++ STL which returns the reference of value if key matches in the container. If no key is found then it inserts that key into container.
mapped_type& operator(key_type&& k);
Parameter: It takes parameter as key whose mapped value is accessed.
Return type: Returns a reference associated to that key.
5 : 6 3 : 4 1 : 2 10 : 0 1 : 2 5 : 0 3 : 2 25 : 0
c : 6 b : 4 a : 2 f : 0 a : 2 b : 2 c : 0 d : 0
Time Complexity O(n) in worst case.
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