class Solution {

public:

    vector<vector<char>> updateBoard(vector<vector<char>>& board, vector<int>& click)

    {

        if (board.empty() || board[0].empty())

        {

            return {};

        }

        int m = board.size(), n = board[0].size(), row = click[0], col = click[1], cnt = 0;

        if (board[row][col] == 'M')

        {

            board[row][col] = 'X';

        }

        else

        {

            for (int i = -1; i < 2; ++i)

            {

                for (int j = -1; j < 2; ++j)

                {

                    int x = row + i, y = col + j;

                    if (x < 0 || x >= m || y < 0 || y >= n)

                    {

                        continue;

                    }

                    if (board[x][y] == 'M')

                    {

                        ++cnt;

                    }

                }

            }

            if (cnt > 0)

            {

                board[row][col] = cnt + '0';

            }

            else

            {

                board[row][col] = 'B';

                for (int i = -1; i < 2; ++i)

                {

                    for (int j = -1; j < 2; ++j)

                    {

                        int x = row + i, y = col + j;

                        if (x < 0 || x >= m || y < 0 || y >= n)

                        {

                            continue;

                        }

                        if (board[x][y] == 'E')

                        {

                            vector<int> nextPos{x, y};

                            updateBoard(board, nextPos);

                        }

                    }

                }

            }

        }

        return board;

    }

};