[leedcode 228] Summary Ranges

Given a sorted integer array without duplicates, return the summary of its ranges.

For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"].

public class Solution {
    public List<String> summaryRanges(int[] nums) {
        //注意从0开始遍历,使用一个temp标记当前遍历到的下标值,然后比较nums[i+1]-nums[i]==1,
        //比较是否range只有一个值,然后保存结果,需要注意的是:内层while循环需要判断i的范围!!

        ArrayList<String> res=new ArrayList<String>();
        if(nums==null||nums.length<=0) return res;
        StringBuilder seq;
        for(int i=0;i<nums.length;i++){
            int temp=nums[i];
            while(i<nums.length-1&&nums[i+1]-nums[i]==1){
                i++;
            }
            if(nums[i]!=temp){
                res.add(temp+"->"+nums[i]);
            }else{
                res.add(temp+"");
            }
        }
        return res;
    }
}

 

posted @ 2015-08-08 15:16  ~每天进步一点点~  阅读(116)  评论(0编辑  收藏  举报