"""
The array-form of an integer num is an array representing its digits in left to right order.

For example, for num = 1321, the array form is [1,3,2,1].
Given num, the array-form of an integer, and an integer k, return the array-form of the integer num + k.

Example 1:
Input: num = [1,2,0,0], k = 34
Output: [1,2,3,4]

Explanation: 1200 + 34 = 1234
Example 2:
Input: num = [2,7,4], k = 181
Output: [4,5,5]
Explanation: 274 + 181 = 455

Example 3:
Input: num = [2,1,5], k = 806
Output: [1,0,2,1]
Explanation: 215 + 806 = 1021

Constraints:
1 <= num.length <= 10^4
0 <= num[i] <= 9
num does not contain any leading zeros except for the zero itself.
1 <= k <= 10^4

"""
from typing import List


class Solution:
    def addToArrayForm(self, num: List[int], k: int) -> List[int]:
        carry = k
        for i in range(len(num) - 1, -1, -1):
            carry, num[i] = divmod(num[i] + carry, 10)
        if carry:
            num = [int(c) for c in str(carry)] + num
        return num
