LeetCode 989 - Add to Array-Form of Integer


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

      public List<Integer> addToArrayForm(int[] A, int K) {
        int N = A.length;
        int cur = K;
        List<Integer> ans = new ArrayList<>();

        int i = N;
        while (--i >= 0 || cur > 0) {
          if (i >= 0)
            cur += A[i];
          ans.add(cur % 10);
          cur /= 10;
        }

        Collections.reverse(ans);
        return ans;

      }

    https://leetcode.com/problems/add-to-array-form-of-integer/discuss/234488/JavaC%2B%2BPython-Take-K-itself-as-a-Carry
        public List<Integer> addToArrayForm(int[] A, int K) {
            List<Integer> res = new LinkedList<>();
            for (int i = A.length - 1; i >= 0; --i) {
                res.add(0, (A[i] + K) % 10);
                K = (A[i] + K) / 10;
            }
            while (K > 0) {
                res.add(0, K % 10);
                K /= 10;
            }
            return res;
        }

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