转置矩阵-暴力解法&一行代码

输入：[[1,2,3],[4,5,6],[7,8,9]]
输出：[[1,4,7],[2,5,8],[3,6,9]]

输入：[[1,2,3],[4,5,6]]
输出：[[1,4],[2,5],[3,6]]

    1 <= A.length <= 1000
    1 <= A[0].length <= 1000

/**
 * @param {number[][]} A
 * @return {number[][]}
 */
var transpose = function (A) {
    var B = []
    for (var i = 0; i < A[0].length; i++) {
        B[i]=[]
        for (var j = 0; j < A.length; j++) {
            B[i][j]=A[j][i]
        }
    }
    return B
}

/**
 * @param {number[][]} A
 * @return {number[][]}
 */
var transpose = function (A) {
    return Array.from({length:A[0].length},(_v,w)=>A.map(v=>v[w]))
};