Summary Ranges leetcode

Given a sorted integer array without duplicates, return the summary of its ranges.

For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"].

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

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vector<string> summaryRanges(vector<int>& nums) {
    vector<string> ret;
    if (nums.size() == )
        return ret;
    int i = ;
    int beg = nums[i];
    while (i < nums.size())
    {
        if (i +  == nums.size() || nums[i+] != nums[i] + )
        {
            if (nums[i] != beg)
                ret.push_back(to_string(beg) + "->" + to_string(nums[i]));
            else
                ret.push_back(to_string(beg));
            if(i +  < nums.size())
                beg = nums[i + ];
        }
        i++;
    }
    return ret;
}