SayHi, C++ (gcc) - rextester

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//g++  5.4.0

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <stdlib.h>
#include <time.h>

using std::string;

class DataMapper
{
    private:
    std::vector<string> _responses;
    std::vector<string> _greetings;
    void generateResponses();
    void generateGreetings();
    
    public:
    DataMapper() {
        generateResponses();
        generateGreetings();
    }
    ~DataMapper() {}
    
    string mapGreetingToResponse(string greeting);
    string convertStringToLower(string s);
    bool greetingExists(string toFind);
    int generateRandomIndex();
    int getResponsesVectorSize() { return _responses.size(); }
    
};

inline void DataMapper::generateResponses(){
    _responses.push_back("Hi there!");
    _responses.push_back("Hello!");
    _responses.push_back("Hey!");
    _responses.push_back("Hi, nice to meet you!");
    _responses.push_back("How are you!");
}

inline void DataMapper::generateGreetings() {
    _greetings.push_back("hi");
    _greetings.push_back("hello");
    _greetings.push_back("hey there");
    _greetings.push_back("hi there");
}

string DataMapper::mapGreetingToResponse(string greeting) {
    greeting = convertStringToLower(greeting);
    
    if(!greetingExists(greeting)) {
        return "I'm sorry I didn't understand.";
    }
    
    int index = generateRandomIndex();
    return _responses[index];
}

string DataMapper::convertStringToLower(string s) {
    std::transform(s.begin(), s.end(), s.begin(), ::tolower);
    return s;
}

bool DataMapper::greetingExists(string toFind) {
    if(std::find(_greetings.begin(), _greetings.end(), toFind) != _greetings.end()) {
        return true;
    }
    return false;
}

int DataMapper::generateRandomIndex() {
    srand(time(0));
    int max = getResponsesVectorSize();
    return rand() % max;
}

int main()
{
    string userGreeting;
    std::getline(std::cin, userGreeting);
    
    DataMapper mapper;
    string botResponse = mapper.mapGreetingToResponse(userGreeting);
    
    std::cout << botResponse << std::endl;
}

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Compilation time: 1.56 sec, absolute running time: 0.13 sec, cpu time: 0.05 sec, memory peak: 3 Mb, absolute service time: 1,7 sec