package question;

import java.util.LinkedList;
import java.util.List;

public class Question228 {
 public List<String> summaryRanges(int[] nums) {
 List<String> res = new LinkedList<>();
 if (nums==null || nums.length==0) return res;
 int start = 0;
 int i = 0;
 for (; i < nums.length-1; i++) {
 if (nums[i]+1!=nums[i+1]) {
 if (start==i) res.add(String.valueOf(nums[start]));
 else res.add(nums[start]+"->"+nums[i]);
 start=i+1;
 }
 }
 if (start==i) res.add(String.valueOf(nums[start]));
 else res.add(nums[start]+"->"+nums[i]);
 return res;
 }
}