Plus One @LeetCode

PROBLEM :

Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.

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SIMPLE c++ IMPLEMENTATION :
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class Solution {
public:
    vector<int> plusOne(vector<int>& digits) {
        int carry=1 ;

        int size=digits.size() ;
        for(int j=size-1;j>=0;j--){
            digits[j]=digits[j]+carry ;
            carry=digits[j]/10 ;
            digits[j]=digits[j]%10 ;
        }
 
        if(carry)
            digits.insert(digits.begin(),carry) ;
           
        return digits ;
    }
};

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