Plus One

class Solution {
public:
    vector<int> plusOne(vector<int> &digits) {
        int i,k=0;
        int a[100];
        for(i=digits.size()-1;i>=0;i--)
           a[k++]=digits[i];
        int c=1;
        for(i=0;i<k;i++)
        {
            int sum=a[i]+c;
            a[i]=sum%10;
            c=sum/10;
        }
        if(c!=0) a[k++]=c;
        vector<int> vec;
        for(i=k-1;i>=0;i--) vec.push_back(a[i]);
        return vec;
    }
};