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c_cpp
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#include <iostream>
#include <vector>
#include <string>
#include <fstream>

using namespace std;

const string PLAYER1 = "X";
const string PLAYER2 = "O";
const string EMPTY = " ";
const string FILENAME = "tic-tac-toe-results.txt";

// function prototypes
void print_board(const vector<vector<string>>& board);
bool is_valid_move(const vector<vector<string>>& board, int row, int col);
bool is_game_over(const vector<vector<string>>& board);
string get_winner(const vector<vector<string>>& board);
void save_result(const string& result);

int main() {
    int size = 0;
    cout << "Enter size of the field (minimum 3, maximum 10): ";
    cin >> size;

    // validate user input
    if (size < 3 || size > 10) {
        cout << "Invalid size. Please enter a number between 3 and 10." << endl;
        return 1;
    }

    // initialize board
    vector<vector<string>> board(size, vector<string>(size, EMPTY));

    // game loop
    string current_player = PLAYER1;
    bool exit_game = false;
    while (!is_game_over(board) && !exit_game) {
        // print board
        print_board(board);

        // get player's move
        int row = -1, col = -1;
        while (!is_valid_move(board, row, col)) {
            cout << current_player << "'s turn. Enter row and column to place your symbol (e.g. 1 2), or enter 'exit' to end the game: ";
            string input;
            getline(cin, input);
            if (input == "exit") {
                exit_game = true;
                break;
            }
            else {
                row = input[0] - '1';
                col = input[2] - '1';
            }
        }

        // make move
        if (!exit_game) {
            board[row][col] = current_player;

            // switch to next player
            current_player = (current_player == PLAYER1) ? PLAYER2 : PLAYER1;
        }
    }

    // print final board and result
    print_board(board);
    if (exit_game) {
        cout << "Game ended by user." << endl;
        save_result("Game ended by user.");
    }
    else {
        string winner = get_winner(board);
        if (winner == "") {
            cout << "Game ended in a tie." << endl;
            save_result("Tie");
        }
        else {
            cout << "Congratulations! " << winner << " wins!" << endl;
            save_result(winner + " wins");
        }
    }

    return 0;
}

void print_board(const vector<vector<string>>& board) {
    int size = board.size();
    cout << "  ";
    for (int i = 1; i <= size; i++) {
        cout << i << " ";
    }
    cout << endl;

    for (int row = 0; row < size; row++) {
        cout << row + 1 << " ";
        for (int col = 0; col < size; col++) {
            cout << board[row][col] << " ";
        }
        cout << endl;
    }
}

bool is_valid_move(const vector<vector<string>>& board, int row, int col) {
    int size = board.size();
    if (row < 0 || row >= size || col < 0 || col >= size) {
        return false;
    }
    if (board[row][col] != EMPTY) {
        return false;
    }
    return true;
}

bool is_game_over(const vector<vector<string>>& board) {
    // check for rows
    for (const auto& row : board) {
        string first_cell = row[0];
        if (first_cell == EMPTY) {
            continue;
        }
        bool all_equal = true;
        for (const auto& cell : row) {
            if (cell != first_cell) {
                all_equal = false;
                break;
            }
        }
        if (all_equal) {
            return true;
        }
    }

    // check for columns
    int size = board.size();
    for (int col = 0; col < size; col++) {
        string first_cell = board[0][col];
        if (first_cell == EMPTY) {
            continue;
        }
        bool all_equal = true;
        for (int row = 1; row < size; row++) {
            if (board[row][col] != first_cell) {
                all_equal = false;
                break;
            }
        }
        if (all_equal) {
        return true;
    }
}

// check for diagonal 1
string first_cell = board[0][0];
if (first_cell != EMPTY) {
    bool all_equal = true;
    for (int i = 1; i < size; i++) {
        if (board[i][i] != first_cell) {
            all_equal = false;
            break;
        }
    }
    if (all_equal) {
        return true;
    }
}

// check for diagonal 2
first_cell = board[0][size - 1];
if (first_cell != EMPTY) {
    bool all_equal = true;
    for (int i = 1; i < size; i++) {
        if (board[i][size - 1 - i] != first_cell) {
            all_equal = false;
            break;
        }
    }
    if (all_equal) {
        return true;
    }
}

// check for tie
for (const auto& row : board) {
    for (const auto& cell : row) {
        if (cell == EMPTY) {
            return false;
        }
    }
}
return true;
}

string get_winner(const vector<vector<string>>& board) { // check for rows for (const auto& row : board) { string first_cell = row[0]; if (first_cell == EMPTY) { continue; } bool all_equal = true; for (const auto& cell : row) { if (cell != first_cell) { all_equal = false; break; } } if (all_equal) { return first_cell; } }

// check for columns
int size = board.size();
for (int col = 0; col < size; col++) {
    string first_cell = board[0][col];
    if (first_cell == EMPTY) {
        continue;
    }
    bool all_equal = true;
    for (int row = 1; row < size; row++) {
        if (board[row][col] != first_cell) {
            all_equal = false;
            break;
        }
    }
    if (all_equal) {
        return first_cell;
    }
}

// check for diagonal 1
string first_cell = board[0][0];
if (first_cell != EMPTY) {
    bool all_equal = true;
    for (int i = 1; i < size; i++) {
        if (board[i][i] != first_cell) {
            all_equal = false;
            break;
        }
    }
    if (all_equal) {
        return first_cell;
    }
}

// check for diagonal 2
first_cell = board[0][size - 1];
if (first_cell != EMPTY) {
    bool all_equal = true;
    for (int i = 1; i < size; i++) {
        if (board[i][size - 1 - i] != first_cell) {
            all_equal = false;
            break;
        }
    }
    if (all_equal) {
        return first_cell;
    }
}

return "";
}

void save_result(const string& result) { ofstream fout(FILENAME, ios::app); if (fout.is_open()) { fout << result << endl; fout.close(); } }