题目
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.
解题思路
把k加到num最后一位，向前遍历进位，如果还有没进位完的，需要在最后处理进位
代码
class Solution:
def addToArrayForm(self, num: List[int], k: int) -> List[int]:
num[-1] += k
for i in range(len(num) - 1, -1, -1):
carry, num[i] = divmod(num[i], 10)
if carry == 0:
break
if i:
num[i - 1] += carry
if carry:
num = list(map(int, str(carry))) + num
return num
