leetcode_game_of_life

class Solution {
public:
    void gameOfLife(vector<vector<int>>& board) {
        int m = board.size(), n = board[0].size();
        int dx[] = {-1,-1,-1,0,0,1,1,1};
        int dy[] = {-1,0,1,-1,1,-1,0,1};
        for(int i = 0; i < board.size(); i++)
        {
            for(int j = 0; j < board[0].size(); j++)
            {
                int cnt = 0;
                for(int k = 0; k < 8; k++)
                {
                    if(i+dx[k] >= 0 && i+dx[k] < m && j + dy[k] >= 0 && j+dy[k] < n && (board[i+dx[k]][j+dy[k]] == 1 ||board[i+dx[k]][j+dy[k]] == 2))
                        cnt++;
                }
                if(board[i][j] && (cnt < 2 || cnt >3))
                    board[i][j] = 2;
                else if(!board[i][j] && cnt == 3)
                    board[i][j] = 3;
            }
        }
        
        for(int i = 0; i < board.size(); i++)
        {
            for(int j = 0; j < board[0].size(); j++)
            {
                board[i][j] = board[i][j] % 2;
            }
        }
        
    }
};