Increment the array LSB digit by one

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Input: digits = [1,2,3]
Output: [1,2,4]
Explanation: The array represents the integer 123.
Input: digits = [9,9,9]
Output: [1,0,0,0]
Explanation: The array represents the integer 999.

vector<int> plusOne(vector<int> &d)
{
    int i = d.size() - 1, sum = 0, carry = 0;
    sum = d[d.size() - 1] + 1;
    carry = sum / 10;
    d[d.size() - 1] = sum % 10;
    i -= 1;
    while (i >= 0 && carry != 0)
    {
        sum = d[i] + carry;
        d[i] = sum % 10;
        carry = sum / 10;
        i -= 1;
    }
    vector<int> v;
    while (carry != 0)
    {
        v.push_back(carry % 10);
        carry /= 10;
    }
    for (auto it : d)
        v.push_back(it);
    return v;
}

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