03. Memory Game

#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
    string gameLine, command;
    getline(cin, gameLine);

    vector<string> game;

    for (int i = 0; i < gameLine.length(); i += 2) {
        game.push_back("");
        game[game.size() - 1] += gameLine[i];
    }

    int counter = 1;

    cin >> command;

    while (command != "end") {
        int index1 = stoi(command), index2 = stoi(command);

        cin >> command;

        if (index1 > stoi(command)) {
            index1 = stoi(command);
        }
        else {
            index2 = stoi(command);
        }

        if (index1 >= 0 && index1 < game.size() && index2 >= 0 && index2 < game.size() && index1 != index2) {
            if (game[index1] == game[index2]) {
                cout << "Congrats! You have found matching elements - " << game[index1] << "!\n";
                game.erase(game.begin() + index2);
                game.erase(game.begin() + index1);
                if (game.size() == 0) {
                    cout << "You have won in " << counter << " turns!\n";
                    return 0;
                }
            }
            else {
                cout << "Try again!\n";
            }
        }
        else {
            cout << "Invalid input! Adding additional elements to the board\n";
            string elementValue = '-' + to_string(counter) + 'a';
            game.insert(game.begin() + game.size() / 2, { elementValue, elementValue});
        }

        counter++;
        cin >> command;
    }

    cout << "Sorry you lose :(\n";
    for (auto& s : game) {
        cout << s << ' ';
    }

    return 0;
}