677. Map Sum Pairs

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Design a map that allows you to do the following: - Maps a string key to a given value. - Returns the sum of the values that have a key with a prefix equal to a given string. Implement the MapSum class: - MapSum() Initializes the MapSum object. - void insert(String key, int val) Inserts the key-val pair into the map. If the key already existed, the original key-value pair will be overridden t

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solution.cppC++17

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