228. 汇总区间 Java版

class Solution {
    public List summaryRanges(int[] nums) {

        List res = new ArrayList<>();

        int n = nums.length;

        if(n==0)
            return res;

        int i=0;

        StringBuilder s;

        while(i");
                s.append(nums[i]);
            }

            res.add(s.toString());
            i++;
        }

        return res;
    }
}