867. Transpose Matrix

[jzhangnu]

    let res = [];
    if (A.length == 0) return []
    for (let i = 0; i < A[0].length; i++) {
        let temp = [];
        for (let j=0; j<A.length; j++) {
            temp.push(A[j][i])
        }
        res.push(temp)
    }

    return res