新年好呀！

代码：

class Solution:
    def construct2DArray(self, original: List[int], m: int, n: int) -> List[List[int]]:
        if len(original) != m * n:
            return []
        ans = [[0] * n for _ in range(m)]
        for i in range(len(original)):
            r = i // n
            c = i % n
            ans[r][c] = original[i]

        return ans