228. Summary Ranges

一次AC，还是比较简单的

class Solution {
public:

    string func(int start,int end,vector<int>& nums)
    {
        if(start==end)
            return to_string(nums[start]);

        else
            return to_string(nums[start])+"->"+to_string(nums[end]);
    }

    vector<string> summaryRanges(vector<int>& nums) {

        vector<string> result;
        if(nums.size()==0)
            return result;

        int start=0;
        int now=0;
        int next=1;

        while(next<nums.size())
        {
            while(next<nums.size()&&nums[now]+1==nums[next])
            {
                now=next;
                next++;
            }
            result.push_back(func(start,now,nums));
            start=next;
            now=next;
            next++;
        }
        if(next==nums.size())
            result.push_back(func(start,nums.size()-1,nums));

        return result;
    }
};