class Solution {
public:
    int countBattleships(vector<vector<char>>& board) {
        int res=0;
        int R=board.size();
        int C=board[0].size();
        for (int i=0;i<R;i++)
            for (int j=0; j<C; j++)
                    if( (board[i][j]=='X') &&
                        (i==0 || board[i-1][j]=='.') &&
                        (j==0 || board[i][j-1]=='.'))res++;
        return res;
    }
};