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Task Description
interval_map<K,V> is a data structure that efficiently associates intervals of keys of type K with values of type V. Your task is to implement the assign member function of this data structure, which is outlined below.
interval_map<K, V> is implemented on top of std::map. In case you are not entirely sure which functions std::map provides, what they do and which guarantees they provide, we provide an excerpt of the C++ standard here:
Each key-value-pair (k,v) in the std::map means that the value v is associated with the interval from k (including) to the next key (excluding) in the std::map.
Example: the std::map (0,'A'), (3,'B'), (5,'A') represents the mapping