/**
 * pascal
 * @author guobin201314@gmail.com on 2019-01-16
 */

export const pascal = (numRows: number): any => {
    if (numRows === 0) {
        return [];
    }

    const res = [[1]];

    for (let i = 1; i < numRows; i++) {
        res[i] = [];

        for (let j = 0; j < i + 1; j++) {
            res[i][j] = (res[i - 1][j] || 0) + (res[i - 1][j - 1] || 0);
        }
    }

    return res;
};