DEV Community πŸ‘©β€πŸ’»πŸ‘¨β€πŸ’»

DEV Community πŸ‘©β€πŸ’»πŸ‘¨β€πŸ’» is a community of 963,864 amazing developers

We're a place where coders share, stay up-to-date and grow their careers.

Create account Log in
SalahElhossiny
SalahElhossiny

Posted on

Battleships in a Board Count

Given an m x n matrix board where each cell is a battleship 'X' or empty '.', return the number of the battleships on board.

Battleships can only be placed horizontally or vertically on board. In other words, they can only be made of the shape 1 x k (1 row, k columns) or k x 1 (k rows, 1 column), where k can be of any size. At least one horizontal or vertical cell separates between two battleships (i.e., there are no adjacent battleships).

var countBattleships = function(board) {

    if (board === null || board.length === 0 || board[0].length == 0 ) 
        return 0;

    let res = 0;

    const m = board.length;
    const n = board[0].length;

    for(let i = 0; i < m; i++) {
        for (let j = 0; j < n; j++) {
            if (board[i][j] === '.' 
                || 
                    (i > 0 && board[i - 1][j] === 'X') 
                || 
                    (j > 0 && board[i][j - 1] === 'X')
               ) 
                continue;
            res++;
        }
    }

    return res;
};



Enter fullscreen mode Exit fullscreen mode

Top comments (0)

πŸ‘‹ Hey, my name is Noah and I’m the one who set up this ad. My job is to get you to join DEV, so if you fancy doing me a favor, I’d love for you to create an account.

If you found DEV from searching around, here are a couple of our most popular articles on DEV: