228. Summary Ranges

挺简单的没什么要点，也没有什么边界情况

    public List<String> summaryRanges(int[] nums) {
    List<String> res = new ArrayList<String>();
        if(nums.length == 0) {
            return res;
        }
        for(int i = 0; i < nums.length; i++) {
            int start = i;
            int end = i;
            while(end < nums.length - 1 && nums[end+1] == nums[end] + 1) {
                end++;
            }
            i = end;
            String cur = String.valueOf(nums[start]);
            if(start != end) {
                cur += "->";
                cur += String.valueOf(nums[end]);
            }
            res.add(cur);
        }
        return res;
    }