0989. Add to Array-Form of Integer

https://leetcode.com/problems/add-to-array-form-of-integer

Description

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

Example 4:

**Input:** num = [9,9,9,9,9,9,9,9,9,9], k = 1
**Output:** [1,0,0,0,0,0,0,0,0,0,0]
**Explanation:** 9999999999 + 1 = 10000000000

Constraints:

• 1 <= num.length <= 104

• 0 <= num[i] <= 9

• num does not contain any leading zeros except for the zero itself.

• 1 <= k <= 104

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