题解 | #螺旋矩阵#

/**
 * 
 * @param matrix int整型二维数组 
 * @return int整型一维数组
 */
function spiralOrder( matrix ) {
    let result = [];
    if (matrix.length == 0) return result;
    let m = matrix.length, n = matrix[0].length;
    const dir = [[0, 1],[1, 0],[0, -1],[ -1, 0]];
    let x = 0,y=0;
    let d = 0;
    for (let i = 0; i< m*n; i++) {
        result.push(matrix[x][y]);
        matrix[x][y] = Number.MAX_SAFE_INTEGER;
        let dx = x + dir[d][0], dy = y + dir[d][1];
        if (dx < 0 || dx >= m || dy < 0 || dy >= n || matrix[dx][dy] == Number.MAX_SAFE_INTEGER) {
            d = (d + 1) % 4;
            dx = x + dir[d][0];
            dy = y + dir[d][1];
        }
        x = dx;
        y = dy;
    }
    return result;
}
module.exports = {
    spiralOrder : spiralOrder
};