Question: Complete the c++ function string histogram (const vector & v): so that given the reference to a vector of strings, return, in the specified format,

Complete the c++ function string histogram (const vector  & v): so that given the reference to a vector of strings, return, in the specified format, a count of the strings, from the most frequent to the least frequent. For example: given v = {"dog", "lion", "lion", "seal", "dog", "dog", "dog"} will return "[dog: 4] [lion: 2] [seal: 1]"

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