Convert 1D Array Into 2D Array

class Solution:
    def construct2DArray(self, original: List[int], m: int, n: int) -> List[List[int]]:
        
        if m * n != len(original):
            return []
        adjac = [[0 ]  * n for j in range(m)]
        i = 0
        z = 0
        while i < m:
            for j in range(n):
                adjac[i][j]  = original[z]
                z += 1
            i +=1
        return adjac