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Add Number to Array-Form Integer

EasyP2Coding

The array form of a non-negative integer is the array of its digits from most significant to least. For example 1321 is [1,3,2,1].

Given num, the array form of a number, and an integer k, return the array form of their sum. The result has no leading zeros (except for the number 0, which is [0]).

Example 1

Input
num = [1,2,3], k = 12
Output
[1,3,5]
Why
123 + 12 = 135.

Example 2

Input
num = [9,9,9], k = 1
Output
[1,0,0,0]

Example 3

Input
num = [0], k = 0
Output
[0]

Constraints

  • 1 <= num.length <= 10^4
  • 0 <= num[i] <= 9
  • num has no leading zeros except for the number 0 itself
  • 0 <= k <= 10^4

Hints

Run checks the 3 visible tests, Submit all 10.