As usual, below my proposed solution but try to code it by yourself ;)

   

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

		vector<string> ranges;

		// Check if nums is empty
		if(nums.size() < 1)
			return ranges;

		int vmin, prev;
		vmin = nums[0];
		prev = vmin;

		for(int i=1; i < nums.size(); i++)
		{
			if(nums[i] > prev + 1)
			{
				if(prev == vmin)
					ranges.push_back(to_string(vmin));
				else
					ranges.push_back(to_string(vmin) + "->" + to_string(prev));

				vmin = nums[i];
				prev = vmin;
			}
			else
				prev = nums[i];
		}

		if(prev == vmin)
			ranges.push_back(to_string(vmin));
		else
			ranges.push_back(to_string(vmin) + "->" + to_string(prev));

		return ranges;
	}