Diatomic Encoding and decoding

 #include <iostream>

#include <map>

#include <string>

using namespace std;

string diatomicEncode(string &data, map<string, char> &pairMap) {

    string encodedData = "";

    int i = 0;

    while (i < data.size()) {

        if (i + 1 < data.size()) {

            string pair = data.substr(i, 2);  

            if (pairMap.find(pair) != pairMap.end()) {

                encodedData += pairMap[pair];

                i += 2;  // Skip the next character as it's part of the current pair

                continue;

            }

        }

       

        encodedData += data[i];

        i++;

    }

    return encodedData;

}

string diatomicDecode(string &encodedData, map<char, string> &reversePairMap) {

    string decodedData = "";

    for (size_t i = 0; i < encodedData.size(); i++) {

        char currentChar = encodedData[i];

        if (reversePairMap.find(currentChar) != reversePairMap.end()) {

            decodedData += reversePairMap[currentChar];

        } else {

            decodedData += currentChar;

        }

    }

    return decodedData;

}

void displayEncodedData(const string &encodedData) {

    cout << "Encoded Data: ";

    for (char c : encodedData) {

        cout << c;  

    }

    cout << endl;

}

int main() {

 

    string data = "THE QUICK BROWN FOX JUMPS OVER THE";

 

    map<string, char> pairMap = {

        {"TH", '@'},  

        {"HE", '#'},  

        {"QU", '$'},  

        {"BR", '%'},

        {"FO", '^'},

        {"JU", '&'},  

        {"OV", '*'}

    };

    map<char, string> reversePairMap;

    for (const auto &entry : pairMap) {

        reversePairMap[entry.second] = entry.first;

    }

   

    string encodedData = diatomicEncode(data, pairMap);

    displayEncodedData(encodedData);

   

    string decodedData = diatomicDecode(encodedData, reversePairMap);

    cout << "Decoded Data: " << decodedData << endl;

    return 0;

}