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989. Add to Array-Form of Integer

Description

For a non-negative integer X, the array-form of X is an array of its digits in left to right order.  For example, if X = 1231, then the array form is [1,2,3,1].

Given the array-form A of a non-negative integer X, return the array-form of the integer X+K.

 

    Example 1:

    Input: A = [1,2,0,0], K = 34
    Output: [1,2,3,4]
    Explanation: 1200 + 34 = 1234
    

    Example 2:

    Input: A = [2,7,4], K = 181
    Output: [4,5,5]
    Explanation: 274 + 181 = 455
    

    Example 3:

    Input: A = [2,1,5], K = 806
    Output: [1,0,2,1]
    Explanation: 215 + 806 = 1021
    

    Example 4:

    Input: A = [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
    

     

    Note:

    1. 1 <= A.length <= 10000
    2. 0 <= A[i] <= 9
    3. 0 <= K <= 10000
    4. If A.length > 1, then A[0] != 0

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